lose one's cool
Fly off handle
To lose one's cool is to lose composure—to become angry, flustered, or visibly upset after maintaining calm.
The phrase implies a break in self-control: She kept it together through the meeting but finally lost her cool when he interrupted her again.
Cool here represents emotional control, and losing it means that control has slipped.
- flip outLose emotional control suddenly
- hit the roofBecome extremely angry suddenly
- hit the ceilingLose one's temper suddenly
- see redBecome intensely angry
- fly off the handleLose temper suddenly
fly into a rage · shouting · go ballistic · anger · yelling · boil over · provocation · snapping · frustration · composure · exasperation · blow a fuse · have a cow · rage · freak out · go off the deep end · fury · annoyance
lose one's coolkeep one's cool
Maintain emotional control
stay calm · keep calm · stay cool · keep one's head · hold it together
cool, lose, flustered, fluster, ruffles, flusters, cool-headed, lose one's temper, losing one's cool