Meaning
Don't expect it soon or at all, a slim chance.
Origin
From 20th-century America, tied to 1940s slang; 'hold breath' meant tense wait, flipped by 1950s for no. A 1955 'Life' uses it for a dud vow.
Usage Examples
- He'll call? Don't hold your breath.
- Don't hold your breath for that raise.
- Rain soon? Don't hold your breath.