Dictionary of English Idioms & Idiomatic Expressions

~ O ~

Object lesson
Odds and ends
Off colour
Off the beaten track
Off the chart
Off the cuff
Off the grid
Off the hook
Off the mark
Off the rails
Off the record
Off the scale
Off the shelf
Off the top of your head
Off the track
Off the wall
Off your chump
Off your rocker
Off-hand
Oh, my goodness!
Old chestnut
Old flames die hard
Old friends and old wine are best
Old hat
Old wive's tale
Oldest trick in the book
Olive branch
On a fishing expedition
On a roll
On a silver platter
On all fours
On Carey Street
On good terms
On hold
On ice
On pins and needles
On tenterhooks
On the ball
On the blink
On the blower
On the carpet
On the case
On the cheap
On the dot
On the factory floor
On the fiddle
On the flip side
On the fly
On the game
On the ground
On the hoof
On the house
On the lam
On the level
On the line
On the make
On the map
On the never-never
On the nod
On the nod
On the nod
On the nose
On the rebound
On the right foot
On the ropes
On the run
On the same page
On the same wavelength
On the shelf
On the skids
On the sly
On the stump
On the take
On the tip of your tongue
On the trot
On the up and up
On the up and up
On the wagon
On the wallaby track
On top of the world
On your high horse
On your last legs
On your soapbox
On your tod
On your toes
Once bitten, twice shy
Once in a blue moon
One bad apple
One fell swoop
One for the road
One good turn deserves another
One hand washes the other
One man's loss is another man's gain
One man's meat is another man's poison
One man's trash is another man's treasure
One over the eight
One swallow does not make a summer
One-man band
One-off
One-trick pony
Oops a daisy
Open all hours
Open book
Open old sores
Open old wounds
Opening a can of worms
Opportunity knocks but once
Other side of the coin
Out and about
Out in the sticks
Out like a light
Out of hand
Out of my league
Out of pocket
Out of sight, out of mind
Out of sorts
Out of the blue
Out of the box
Out of the frying pan, into the fire
Out of the gate running
Out of the left field
Out of the mouths of babes
Out of the woods
Out of this world
Out of your hair
Out of your mind
Out of your own pocket
Out on a limb
Out to lunch
Out-and-out
Over a barrel
Over and over
Over my dead body
Over the counter
Over the hill
Over the moon
Over the top
Over your head
Over-egg the pudding