crack up

/ˈkɹæk ˈʌp/ · verb

Meaning

To laugh.
To laugh heartily.
To cause to laugh heartily.
To tease (someone) or tell jokes at the expense of (someone).
To break.
To become insane; to suffer a mental breakdown.
To break down or fall apart; to stop functioning; to shatter.
To separate a group.
To crash an aircraft or automobile.
To remove the shell from nuts.
To crack (petroleum). (to break down (a complex molecule), especially with the application of heat: to pyrolyse)
To affect the image of something.
Funny; hilarious

Compare Japanese 笑う (warau, “laugh, smile”), suffixed from Japanese 割る (waru, “crack”).

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