Meaning of “temper” - Learner’s Dictionary

temper

noun uk us /ˈtempər/

B2 [ C, U ] If someone has a temper, they become angry very easily:

He's got a really bad temper.
be in a bad/foul, etc temper

to be feeling angry:

I'd avoid her if I were you - she's in a foul temper.
lose your temper (with sb)

B2 to suddenly become very angry:

I lost my temper with the children this morning.
keep your temper

to succeed in staying calm and not becoming angry

(Definition of “temper noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)