lose cool

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.

to suddenly become very angry and start shouting I try to be patient with her but she made so many irritating comments, I absolutely lost my cool.

to suddenly become very angry and start shouting I try to be patient with her but she was so irritating in that meeting, I just lost my cool.

Name	Pronounced	Usage
Reinout	-	Dutch
Betsy	['betsi]
Mallt	-	Welsh
Sefton	SEF-tən	English (Rare)
Mykolas	-	Lithuanian
Bean	[bi:n]