Meaning of the word "someone's blood is up" in English

What does "someone's blood is up" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

someone's blood is up

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

Idiom

1.

someone is very angry or excited

Example:
When he heard the news, his blood was up and he started shouting.
Don't say anything to him now, his blood is really up.
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