Meaning of “spit blood/venom” in the English Dictionary

british dictionary

"spit blood/venom" in British English

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spit blood/venom

US also spit nails, Australian English also spit tacks

to speak in an angry way, or to show anger:

I thought he was going to spit blood when he saw what had happened.

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