Meaning of “don't hold your breath” in the English Dictionary

british dictionary

"don't hold your breath" in British English

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don't hold your breath


said in order to tell someone that an event is not likely to happen:

She said she might finish by this afternoon but don't hold your breath.

don't hold your breath


used to tell someone not to expect something to happen for a very long time:

She said she'd get back to us, but don't hold your breath!

(Definition of “don't hold your breath” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)