don't hold your breath

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don't hold your breath

Don't expect something to happen. (The idea being that one couldn't hold one's breath long enough for the unlikely thing to happen.) If know you hope Monica comes to the meeting, but don't hold your breath—she hasn't been to one all year.
See also: breath, hold
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

Don't hold your breath.

Fig. Do not stop breathing waiting for something to happen that won't happen. (Meaning that it will take longer for it to happen than you can possibly hold your breath.) Tom: The front yard is such a mess. Bob: Bill's supposed to rake the leaves. Tom: Don't hold your breath. He never does his share of the work. Sally: Someone said that gasoline prices would go down. Bob: Oh, yeah? Don't hold your breath.
See also: breath, hold
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

don't hold your breath

used to indicate that something is very unlikely to happen.
See also: breath, hold
Farlex Partner Idioms Dictionary © Farlex 2017

with bated breath

Holding one’s breath back in expectation. To bate meant to restrain, but this verb is scarcely heard today except in this cliché, which itself has an archaic sound and often is used ironically. Shakespeare used it in The Merchant of Venice (1.3): “Shall I bend low, and in a bondsman’s key, With bated breath, and whispering humbleness.” A more recent colloquial locution is don’t hold your breath, meaning “don’t wait in vain.”
See also: breath
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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References in periodicals archive ?
Mobile phone yakkers don't hold your breath, this smart footwear won't be on the fashion runways for several years.
Experts said throughout 2000 that prices had to decrease some time, but prices rose by a third during the first three quarters of the year Oil company executives say prices in early 2001 should fall from about US$32 a barrel to a range of $22 to $28 per barrel--but don't hold your breath.
In other words, don't hold your breath that they're going to be coming up with anything anytime soon.
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Actually, don't hold your breath on that because it looks as if the trip will give Sir John Bullock a chance to reveal his true colours; thankfully, Rose does find a knight in shining armour - albeit from an unexpected source.
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And wouldn't it be great to have him serving you all night?" Perhaps that's how he could make it up to Mackie - but don't hold your breath!
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