crack up

/ˈkɹæk ˈʌp/ verb

To laugh heartily. (intransitive) · It was hilarious. We were cracking up the whole time.
To cause to laugh heartily. (transitive) · The joke about the nuns in the bath cracked me up.
To tease (someone) or tell jokes at the expense of (someone). (intransitive, slang) · He's always cracking up at me about that.
To become insane; to suffer a mental breakdown. (dated, intransitive) · She got through the war, but cracked up when her sister died.
To break down or fall apart; to stop functioning; to shatter. · The university was really cracking up, losing faculty, students and donors, and it seemed like to go under.· My motorcycle cracked up before I arrived.
To separate a group. (transitive) · I have to crack up that little clique.
To crash an aircraft or automobile. (US)
To remove the shell from nuts. (transitive) · We can send you a hundred pounds a month of pecans to crack up.

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