someone's blood is up

US /ˈsʌm.wʌnz blʌd ɪz ʌp/
UK /ˈsʌm.wʌnz blʌd ɪz ʌp/
"someone's blood is up" picture
1.

激怒している, 興奮している

someone is very angry or excited

:
When he heard the news, his blood was up and he started shouting.
その知らせを聞いて、彼は激怒し、叫び始めた。
Don't say anything to him now, his blood is really up.
今彼に何も言うな、彼は本当に怒っている