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.
See also: blow, cool
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

blow your cool

lose your composure; become angry or agitated. informal
See also: blow, cool
Farlex Partner Idioms Dictionary © Farlex 2017
See also:
References in periodicals archive ?
It is never cool "to blow your cool." It has to do with concealing rather than revealing--so shades are usually cool.
If there was ever a perfect place to blow your cool, it's Blackpool.