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
Farlex Dictionary of Idioms.

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
Collins COBUILD Idioms Dictionary, 3rd ed.

lose your cool

lose control of your temper or emotions. informal
See also: cool, lose
Farlex Partner Idioms Dictionary

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
Farlex Partner Idioms Dictionary
See also:
  • lose (one's) cool
  • lose cool
  • lose one’s cool
  • lose one's cool
  • blow (one's) cool
  • blow cool
  • blow one’s cool
  • blow one's cool
  • blow your cool
  • cooled out
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.
Never let Cyem see you sweat
You can't lose your cool during a game and there won't be a repeat.
RANGEL'S ANGEL VOW
SO THAT YON WON'T LOSE YOUR COOL OR YOUR BATTERIES THE BATTERY PACK IS A TIGHT FIT.
DAGR battery pack is a tight fit
Don't lose your cool, because things will return to normal soon enough.
Star signs
Before you lose your cool, try a couple of drops of Boots' Time To Focus aromatherapy oil on your pulse points.
Beauty Style: Botanics Pulse Points range
BRYAN ROBSON has warned his Sheffield United players ahead of his first Steel City derby: Lose your cool and you'll lose the game.
Football: GIVE ME COLD STEEL; Coca Cola CHAMPIONSHIP Hotting up for the Sheffield derby Robbo 'stay cool' call for his Blades Sheff Wed v Sheff Utd, today, 3pm