Also found in: Dictionary, Thesaurus, Encyclopedia.
Like this video? Subscribe to our free daily email and get a new idiom video every day!
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.
lose one's cooland 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.