sweat blood

sweat blood (third-person singular simple present sweats blood, present participle sweating blood, simple past and past participle sweated blood or sweat blood)

1. (informal) To work very hard.

   Synonym: sweat one's guts out

2. (informal) To be extremely anxious.

   Synonym: sweat bullets

• blood, sweat and tears

• “sweat blood”, in Cambridge English Dictionary, Cambridge, Cambridgeshire: Cambridge University Press, 1999–present.
• “sweat blood” (US) / “sweat blood” (UK) in Macmillan English Dictionary.
• “sweat blood” in Longman Dictionary of Contemporary English, Longman.
• “sweat blood”, in Collins English Dictionary.

• blood sweat