- Once bitten, twice shy.
- One father is (worth) more than a hundred schoolmasters.
- One good turn deserves another.
- One of these days is none of these days.
- One today is worth two tomorrows.
- One man’s meat is another man’s poison.
- One man’s trash is another man’s treasure.
- Opportunity seldom knocks twice.
- Out of the mouth of babes and sucklings.
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