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

1.
怒火中烧, 非常生气
someone is very angry or excited
:
•
When he heard the news, his blood was up and he started shouting.
当他听到这个消息时,他怒火中烧,开始大喊大叫。
•
Don't say anything to him now, his blood is really up.
现在别跟他说什么,他真的怒火中烧。