Idioms Beginning With: 'O'

• On the stroke
• On the stump
• On the table
• On the take
• On the tip of your tongue
• On the trot
• On the up and up
• On the uptake
• On the wagon
• On the wallaby track
• On top of the world
• On track
• 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 in the eye
• 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 nail drives out another
• One over the eight
• One swallow does not make a summer
• One-man band
• One-off
• One-trick pony
• Only the wearer knows where the shoe pinches
• Oops a daisy
• Open all hours
• Open book
• Open old sores
• Open old wounds
• Open secret
• Open the floodgates
• Open-and-shut
• Opening a can of worms
• Opportunity knocks but once
• Other fish to fry
• Other side of the coin
• Out and about
• Out in the sticks
• Out like a light

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