flip one's lid

Etymology
Originally an Americanism; from the analogy of a boiling pot explosively popping off its lid due to built-up internal pressure.

Verb

 * 1)  To become explosively angry, to lose one's temper.
 * 2)   To be very scared.
 * 1)   To be very scared.
 * 1)   To be very scared.
 * 1)   To be very scared.
 * 1)   To be very scared.