Meaning of “sweat blood” in the English Dictionary

british dictionary

"sweat blood" in British English

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sweat blood

also sweat your guts out informal

to make a great effort:

We sweated blood to get the work finished on time.
I've been sweating blood over this report.

(Definition of “sweat blood” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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