crack up
Pronunciation:
verb
Definitions
To laugh heartily.
Example: It was hilarious. We were cracking up the whole time.
To cause to laugh heartily.
Example: The joke about the nuns in the bath cracked me up.
To become insane; to suffer a mental breakdown.
Example: She got through the war, but cracked up when her sister died.
(usually passive, usually negative) To cry up; to extol.
Example: This new computer system is not what it was cracked up to be.
adjective
Definitions
Funny; hilarious
Example: That joke was crack up.