blow your cool
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blow (one's) cool
To lose control of one's composure, temper, or nerve. He really blew his cool when the waiter dropped his food. I really blew my cool during the interview.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
blow your coollose your composure; become angry or agitated. informal
Farlex Partner Idioms Dictionary © Farlex 2017