(one's) blood is up

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(one's) blood is up

One is in an angry, aggressive, or violent mood; one is looking or ready for a fight. Everyone in the office knows to avoid the boss when her blood is up. No good will come of calling them while your blood is up—wait till you're calmer. Let's get out of here—that angry biker's blood is clearly up about something.
See also: blood, up
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.

someone's blood is up

someone is in a fighting mood.
See also: blood, up
Farlex Partner Idioms Dictionary © Farlex 2017

your/somebody’s ˌblood is ˈup

(British English) somebody feels angry and aggressive: Normally, he’s a quiet man, but when his blood is up he can be very violent.
See also: blood, up
Farlex Partner Idioms Dictionary © Farlex 2017
See also:
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