like (one's) life depends on it(redirected from like their lives depended on it)
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like (one's) life depends on it
With maximum, possibly desperate, effort or energy (i.e., as if one is at risk of losing one's life if one fails). The boxer started the third round throwing punches like his life depended on it. This project could very well determine the future of the company, so start working like your lives depend on it!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.