(one's) blood is up

(redirected from his 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.
See also: blood, up
Farlex Dictionary of Idioms. © 2015 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: