Phrases beginning with O

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Oil and water don’t mix
Old soldiers never die, they simply fade away
Once a thief, always a thief
Once bitten, twice shy
One good turn deserves another
One half of the world does not know how the other half lives
One hand washes the other
One man’s meat is another man’s poison
One might as well be hanged for a sheep as a lamb
One law for the rich and another law for the poor
One swallow does not make a summer
One volunteer is worth ten pressed men
Only fools and horses work
Opportunity never knocks twice at any man’s door
Opposites attract
Out of sight, out of mind
Out of the frying pan into the fire