blow (one's) cool

To lose control of one's composure, temper, or nerve in a given situation. He really blew his cool when the waiter dropped his food. I really blew my cool during the interview.

Common Names:

Name	Pronounced	Usage
Krystiana	krist-YAH-nah	Polish
Kasimira	kah-zee-MEE-rah	German (Archaic)
Patricie	-	Czech
Sladjana	SLAH-jah-nah	Serbian
HallbjÖRn	-	Ancient Scandinavian, Icelandic
Martino	mahr-TEE-no	Italian