O

oar put one’s oar in
oath take an oath
oath under oath
oats sow one’s wild oats
object expense is no object
object Money is no object.
objection not see any objection (to something)
objection raise (an) objection (to someone or something)
objection see no objection (to something)
occasion on occasion
occasion rise to the occasion
occupancy immediate occupancy
occur occur to someone
ocean an ocean of someone or something
ocean a drop in the ocean
oceans oceans of someone or something
odd odd man out
odd the odd something
odds at odds (with someone)
odds for the odds to be against one
odds odds and ends
odor odor of sanctity
of (above and) beyond the call of duty
of acknowledge receipt (of something)
of afraid of one’s own shadow
of after the fashion of someone or something
of ahead of one’s time
of ahead of schedule
of ahead of the game
of ahead of time
of all kinds of someone or something
of all manner of someone or something
of all of a sudden
of all walks of life
of alongside (of) someone or something
of any number of someone or something
of appear out of nowhere
of arguing for the sake of arguing
of arguing for the sake of argument
of as a matter of course
of as a matter of fact
of as a result of something
of as a token (of something)
of (as) black as a stack of black cats
of (as) black as the ace of spades
of (as) close as two coats of paint
of (as) cocky as the king of spades
of (as) crooked as a barrel of fish hooks
of (as) funny as a barrel of monkeys
of as much fun as a barrel of monkeys
of at the bottom of the hour
of at the bottom of the ladder
of at the break of dawn
of at the crack of dawn
of at the drop of a hat

of at the end of nowhere
of at the end of one’s rope
of at the end of one’s tether
of at the end of the day
of at the expense of someone or something
of at the forefront (of something)
of at the height of something
of at the helm (of something)
of at the mercy of someone
of at the point of doing something
of at the rear of something
of at the top of one’s lungs
of at the top of one’s voice
of at the top of the hour
of at the zenith of something
of at this stage of the game
of avail oneself of something
of avenue of escape
of back of the beyond
of back out (of something)
of bag of tricks
of bail out (of something)
of ball of fire
of baptism of fire
of bear the brunt (of something)
of beat the living daylights out of someone
of beat the stuffing out of someone
of beat the tar out of someone
of beginning of the end
of be of service (to someone)
of be of the persuasion that something is so
of be the death of me (yet)
of be the spit and image of someone
of be the spitting image of someone
of beyond the call of duty
of beyond the shadow of a doubt
of big of someone
of Birds of a feather flock together.
of black as a stack of black cats
of black as the ace of spades
of blow something out of all proportion
of bone of contention
of born out of wedlock
of break out (of something)
of break the back of something
of burn one’s bridges in front of one
of by all means of something
of by a show of hands
of by dint of something
of by means of something
of by the nape of the neck
of by the seat of one’s pants
of by the skin of one’s teeth
of by the sweat of one’s brow
of by virtue of something
of by way of something
of by word of mouth
of call of nature
of can’t make heads or tails (out) of someone or
something
of can’t see beyond the end of one’s nose
of can’t see one’s hand in front of one’s face
of can’t stand (the sight of) someone or something
of capable of doing something
of carry (a lot of) weight (with someone or something)
of carry the weight of the world on one’s shoulders
of catch a whiff of something
of catch one’s death (of cold)
of catch sight of someone or something
of catch someone in the act (of doing something)
of change horses in the middle of the stream
of charm the pants off (of) someone
of chicken out (of something)
of chisel someone out of something
of clean out (of something)
of clear of something
of close as two coats of paint
of cock of the walk
of cocky as the king of spades
of come in out of the rain
of come of age
of come out of left field
of come out of nowhere
of come out of one’s shell
of come out of the blue
of come out (of the closet)
of come to think of it
of come within an ace of doing something
of come within an inch of doing something
of con someone out of something
of course of action
of cover a lot of ground
of cover a lot of territory
of crooked as a barrel of fish hooks
of decide in favor of someone or something
of die of a broken heart
of die of boredom
of Don’t let it out of this room.
of do someone out of something
of drive someone out (of office)
of drop out (of something)
of drum someone out of something
of eat out of someone’s hands
of eat someone out of house and home
of elbow someone out (of something)
of end up with the short end of the stick
of even in the best of times
of exchange more than some number of words with
someone
of fall afoul of someone or something
of fall short (of something)
of fan the flames (of something)
of feel a glow of something
of feel on top of the world
of feel out of place
of ferret something out of someone or something
of first of all
of flight of fancy
of flirt with the idea of doing something
of fly in the face of someone or something
of fly in the teeth of someone or something
of fly into the face of danger
of fond of someone or something
of force someone out (of office)

of for fear of something
of for the devil of it
of for the good of someone or something
of for the heck of it
of for the hell of it
of for the life of one
of for the sake of someone or something
of fresh out (of something)
of frighten one out of one’s wits
of frighten the (living) daylights out of someone
of frighten the wits out of someone
of from the bottom of one’s heart
of fruit(s) of one’s labor(s)
of full of beans
of full of bull
of full of hot air
of full of it
of full of Old Nick
of full of oneself
of full of prunes
of full of the devil
of funny as a barrel of monkeys
of get a bang out of someone or something
of get a charge out of someone or something
of get a clean bill of health
of get a grasp of something
of get ahead of oneself
of get (a)hold of someone or something
of get a kick out of someone or something
of get a load of someone or something
of get a lot of mileage out of something
of get an eyeful (of someone or something)
of get a rise out of someone
of get a rough idea (of something)
of get a taste of one’s own medicine
of get at the heart of the matter
of get a whiff of something
of get into the swing of things
of get one’s fill of someone or something
of get one’s nose out of someone’s business
of get on the good side of someone
of get out of a jam
of get out of a mess
of get out of someone’s way
of get out of the way
of get out of the wrong side of the bed
of get rid of someone or something
of get someone or something out of one’s head
of get someone or something out of one’s mind
of get someone or something out of the way
of get someone out of a jam
of get something out of one’s system
of get something out of something
of get the advantage of someone
of get the benefit of the doubt
of get the best of someone
of get the better of someone
of get the drift of something
of get the feel of  something
of get the hang of something
of get the shock of one’s life
of get the short end of the stick
of get the worst of something
of get to the bottom of something
of get to the heart of the matter
of get to the root of the problem
of get up on the wrong side of the bed
of get wind of something
of give a good account of oneself
of give of oneself
of give someone a clean bill of health
of give someone a piece of one’s mind
of give someone a rough idea (of something)
of give someone the benefit of the doubt
of go out of fashion
of go out of one’s way (to do something)
of go out of style
of go to the expense (of doing something)
of go to the trouble (of doing something)
of groan under the burden of something
of grow out of something
of guest of honor
of gyp someone out of something
of hard of hearing
of have a change of heart
of have a good command of something
of have a heart of gold
of have a heart of stone
of have a lot of promise
of have a rough time (of it)
of have a run of bad luck
of have a run of something
of have a whale of a time
of have eyes in the back of one’s head
of have feet of clay
of have none of something
of have something on the tip of one’s tongue
of have the best of both worlds
of have the courage of one’s convictions
of have the feel of something
of have the gift of gab
of have the makings of something
of have the patience of a saint
of have the presence of mind to do something
of have the right-of-way
of have the time of one’s life
of hear a peep out of someone
of hear of something
of hightail it out of somewhere
of hit (someone) like a ton of bricks
of hold one’s end (of the bargain) up
of hotfoot it out of somewhere
of in a (constant) state of flux
of in a month of Sundays
of in and of itself
of in awe (of someone or something)
of in a world of one’s own
of in behalf of someone
of in care of someone
of in case of something
of in consequence (of something)
of in consideration of something
of in contempt (of court)
of in custody of someone or something

of in defiance (of someone or something)
of in favor of someone
of in favor (of someone or something)
of in honor of someone or something
of in hopes of something
of in lieu of something
of in light of something
of in memory of someone
of in need of something
of in one ear and out (of) the other
of in place of someone or something
of in pursuit of something
of in quest of someone or something
of in receipt of something
of ins and outs of something
of in search of someone or something
of in some neck of the woods
of in spite of someone or something
of in terms of something
of in the absence of someone or something
of in the act (of doing something)
of in the best of health
of in the care of someone
of in the case of someone or something
of in the charge of someone
of in the context of something
of in the course of time
of in the event of something
of in the forefront (of something)
of in the interest of someone or something
of in the lap of luxury
of in the line of duty
of in the mainstream (of something)
of in the middle of nowhere
of in the neighborhood of something
of in the nick of time
of in the pink (of condition)
of in the prime of life
of in the swim of things
of in the trust of someone
of in the twinkling of an eye
of in the unlikely event of something
of in the (very) nick of time
of in the wake of something
of in the way of something
of in two shakes of a lamb’s tail
of invasion of (someone’s) privacy
of in view of something
of jump out of one’s skin
of just one of those things
of keep abreast (of something)
of keep one’s nose out of someone’s business
of keep track (of someone or something)
of kind of something
of know (all) the tricks of the trade
of know someone or something like the back of one’s hand
of know someone or something like the palm of one’s hand
of laugh out of the other side of one’s mouth
of laugh something out of court
of lay hold of someone or something
of lead the life of Riley
of least of all
of let go of someone or something
of let out some kind of sound
of let the cat out of the bag
of light out (of somewhere)
of like a bat out of hell
of like a bolt out of the blue
of like a fish out of water
of like one of the family
of live a life of something
of live off the fat of the land
of live out of a suitcase
of live up to one’s end of the bargain
of long and (the) short of it
of lose one’s train of thought
of lose track (of someone or something)
of lots of people or things
of lull someone into a false sense of security
of make a clean breast of something
of make a day of doing something
of make a day of it
of make a federal case out of something
of make a fool out of someone
of make a go of it
of make a great show of something
of make a laughingstock of oneself or something
of make a meal of something
of make a monkey out of someone
of make a mountain out of a molehill
of make an example of someone
of make an exhibition of oneself
of make a night of doing something
of make an issue of someone or something
of make a note of something
of make a nuisance of oneself
of make a point of doing something
of make a point of someone or something
of make a practice of something
of make a silk purse out of a sow’s ear
of make fast work of someone or something
of make fun (of someone or something)
of make hamburger out of someone or something
of make light of something
of make little of someone or something
of make mincemeat out of someone or something
of make nothing of something
of make sense out of someone or something
of make short work of someone or something
of make something out of nothing
of make something (out) of something
of make something up out of whole cloth
of make the best of something
of make the most of something
of make use of someone or something
of march to (the beat of) a different drummer
of matter-of-fact
of middle-of-the-road
of milk of human kindness
of Money is the root of all evil.
of more fun than a barrel of monkeys
of next of kin