Definition of lose one's coolinformal
- She rarely loses her cool.
- He lost his cool and yelled at me.
- After listening patiently, he finally blew his cool.
: to bring to destruction
: to miss from one's possession or from a customary or supposed place
: moderately cold : lacking in warmth
: marked by steady dispassionate calmness and self-control
: lacking ardor or friendliness
: to become cool : lose heat or warmth
: to lose ardor or passion
: to make cool : impart a feeling of coolness to
: a cool time, place, or situation
: absence of excitement or emotional involvement : detachment
: poise, composure
: in a casual and nonchalant manner
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