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keep (one's) temper
To refrain from becoming angered, enraged, or upset due to some provocation; to maintain control of one's composure despite being angry or upset. You're a good driver, but you need to do a better job of keeping your temper when other drivers make mistakes. It's hard to keep my temper with the kids after being kept awake by them all night long.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
keep one's temperand hold one's temper
to hold back an expression of anger. (The opposite of lose one's temper.) She should have learned to keep her temper when she was a child. Sally got thrown off the team because she couldn't hold her temper.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.