lose (one's) 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 one's cool

 and blow one's cool
to lose one's temper; to lose one's nerve. Wow, he really lost his cool! What a tantrum! Whatever you do, don't blow your cool.
See also: cool, lose
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

lose one's cool

see under keep one's cool.
See also: cool, lose
The American Heritage® Dictionary of Idioms by Christine Ammer.

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

lose one’s cool

tv. to lose control; to lose one’s temper. (Compare this with keep one’s cool.) Now, don’t lose your cool. Relax.
See also: cool, lose
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • lose cool
  • lose one’s cool
  • lose one's cool
  • lose your cool
  • blow (one's) cool
  • blow cool
  • blow one’s cool
  • blow one's cool
  • blow your cool
  • cooled out