Idioms starting with “O”
254 idioms
- O ye of little faith
- oat opera
- odd and curious
- odd duck
- odd fish
- odds and ends
- odds and sods
- of course
- of the same leaven
- off and running
- off chance
- off one's tits
- off pat
- off the deep end
- off the grid
- off the hook
- off the scale
- off the top of your head
- offer affordances
- offer one can't refuse
- offer one's condolences
- offer up
- oh dark hundred
- oh dark thirty
- oh dear
- oh my
- oh my goodness gracious
- oh my gosh
- oh well
- oh yes
- oil and water
- oil burner
- oil trash
- oily rag
- old as Methuselah
- old as the hills
- old boy network
- old chestnut
- old enough to vote
- old fart
- old-fashioned look
- old flame
- old fogey
- old friend
- old hand
- old hat
- old head on young shoulders
- old money
- old salt
- old saw
- old school
- old song
- old stager
- old stick
- old wine in a new bottle
- on a first-name basis
- on a regular basis
- on all fours
- on behalf of sb
- on board
- on both sides
- on earth
- on holiday
- on in years
- on Monday
- on my own
- on one's mind
- on one's watch
- on strike
- on television
- on the ball
- on the basis of sth
- on the beach
- on the drum
- on the floor
- on the floor
- on the fly
- on the ground
- on the horn
- on the internet
- on the left
- on the move
- on the one hand
- on the other hand
- on the other side
- on the other side of sth
- on the part of sb
- on the phone
- on the right
- on the same page
- on the side of the angels
- on the sly
- on the street
- on the streets
- on the television
- on the up-and-up
- on the wall
- on the wane
- on the way
- on their own
- on thin ice
- on time
- on top
- on top of sth/sb
- on TV
- on yer bike
- on your own
- once a
- once a month
- once a week
- once a week
- once a year
- once again
- once and for all
- once bitten, twice shy
- once in a blue moon
- once in a while
- once or twice
- one after another
- one age with
- one and only
- one another
- one big happy family
- one brick short of a full load
- one could do it in one's sleep
- one could hear a pin drop
- one day
- one fell swoop
- one flesh
- one for the road
- one-hit wonder
- one-horse race
- one-horse town
- one in the eye for
- one man and his dog
- one-man band
- one moment
- one more again
- one-night stand
- one of His Majesty's bad bargains
- one of those things
- one or two
- one side
- one small step for man, one giant leap for mankind
- one step ahead
- one step forward, two steps back
- one thing led to another
- one thing or another
- one too many
- one-track mind
- one-trick pony
- one up
- one-way ticket to Palookaville
- ones and twos
- one's back is up
- one's bark is worse than one's bite
- one's blood is up
- one's cake is dough
- one's days are numbered
- one's heart in one's mouth
- one's heart out
- one's jig is up
- one's lips are sealed
- one's name is mud
- one's ship comes in
- one's socks off
- one's word is law
- only game in town
- only time will tell
- onward and upward
- onwards and upwards
- open a can of whoop ass
- open book
- open-door policy
- open doors
- open field
- open fire
- open invitation
- open one's legs
- open one's mind
- open one's mouth
- open Pandora's box
- open season
- open someone's eyes
- open the batting
- open the door
- open the floodgates
- open the kimono
- open the schools
- open wide
- opening of an envelope
- opinions are like assholes
- opposed to sth
- opposite number
- or else
- or so
- or somebody
- or something
- or somewhere
- or two
- or what
- or words to that effect
- orange wine
- oranges with oranges
- orchestras
- ordinary people
- Oreo cookie
- ostrich policy
- other fish in the sea
- other half
- other head
- other man
- other side
- other than
- other woman
- otherwise engaged
- ought to
- our era
- out for blood
- out loud
- out of one's depth
- out of one's element
- out of pocket
- out of sight
- out of sorts
- out of sth
- out of the frying pan and into the fire
- out of the question
- out of thin air
- out of this world
- out of touch
- out of whack
- out on a limb
- out on one's feet
- out-paramour the Turk
- out sick
- out there
- out to lunch
- outpope the Pope
- outrun the constable
- outside chance
- outside job
- outside world
- over and over again
- over one's head
- over the course of
- over the hills and far away
- over the top
- over the years
- over there
- over time
- overstep the mark
- ox is in the ditch
- oxygen burning