sweat one's guts out

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1. (informal) to work very hard.

   Synonyms: fight one's guts out, play one's guts out, (UK) slog one's guts out, work one's guts out, work one's ass off, sweat blood

• “work play fight your guts out”, in Cambridge English Dictionary, Cambridge, Cambridgeshire: Cambridge University Press, 1999–present.
• “work slog sweat your guts out” (UK) in Macmillan English Dictionary.
• “work sweat your guts out” in Longman Dictionary of Contemporary English, Longman.
• “sweat ones guts out”, in Collins English Dictionary.
• “to work your guts out”, in Collins English Dictionary.