if (one's) life depended on it(redirected from if their lives depended on it)
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if (one's) life depended on it
Under any circumstances; no matter what. (Used almost exclusively with a negative statement regarding something that one couldn't or wouldn't do.) No way am I going to karaoke night. I couldn't sing if my life depended on it! No thanks, I wouldn't see that film if my life depended on it.