lose one's cool

Verb

 * 1)  To become upset or disconcerted; to lose one's temper.

Translations

 * Dutch: buiten zinnen raken
 * Finnish:
 * French: perdre son sang-froid
 * German: die Fassung verlieren,
 * Maori: tū ngā pihi
 * Polish: wściekać się, wściec się
 * Portuguese: perder a cabeça, perder o sangue frio, passar-se dos carretos,
 * Russian: выходи́ть из себя́, вы́йти из себя́
 * Slovak: stratiť nervy