lose your cool

lose (one's) cool

To lose control of one's composure, temper, or nerve in a given situation. He really lost his cool when the waiter dropped his food. I really lost my cool during the interview.
See also: cool, lose

lose your cool

COMMON If you lose your cool, you suddenly get angry and behave in a bad-tempered or uncontrolled way. At this point, I lost my cool and shouted `for goodness sake, stop!' `Why don't you sit down and have a drink?' — `I don't want a drink,' Anne replied, losing her cool.
See also: cool, lose

lose your cool

lose control of your temper or emotions. informal
See also: cool, lose

keep/lose your ˈcool

(informal) stay calm/get angry, excited, etc: He was very insulting. I really don’t know how I managed to keep my cool.
See also: cool, keep, lose
References in periodicals archive ?
When you lose your cool with one of your internal clients, with a colleague, with someone in the mailroom, or even an outside service provider, the damage to your reputation is probably worse than you realize.
You can't lose your cool during a game and there won't be a repeat.
SO THAT YON WON'T LOSE YOUR COOL OR YOUR BATTERIES THE BATTERY PACK IS A TIGHT FIT.
That's one sure way to lose your cool, especially when you're paying record high gasoline prices,'' Gonzales said.
Don't lose your cool, because things will return to normal soon enough.
BRYAN ROBSON has warned his Sheffield United players ahead of his first Steel City derby: Lose your cool and you'll lose the game.
I had (pitching coach) Larry Rothschild and every Spanish-speaking guy on the team talk to him to make sure - `Don't lose your cool, settle down, we're going to score some runs, just keep it right there.