The meaning of Crack up

phrasal verb

Laugh unrestrainedly

phrasal verb

Suffer an emotional breakdown under pressure.

Usage examples:

I feel i'm cracking up, always on the verge of tears

phrasal verb

Burst into laughter.

Usage examples:

She tries to keep a straight face, but she keeps cracking up

phrasal verb

To become mentally ill

Usage examples:

I think she's cracking up., the story depicts the crack-up of the writers' own partnership., the em…

phrasal verb

To laugh with great enthusiasm, or to cause someone to laugh in this way

Usage examples:

The stories they told cracked me up.