crack up
/ˈkɹæk ˈʌp/verb
RareNot in standard dictionaries
1
To laugh heartily.
2
To cause to laugh heartily.
3
To tease (someone) or tell jokes at the expense of (someone).
4
To become insane; to suffer a mental breakdown.
5
To break down or fall apart; to stop functioning; to shatter.
6
To separate a group.
7
To crash an aircraft or automobile.
8
To remove the shell from nuts.
9
To crack (petroleum). (to break down (a complex molecule), especially with the application of heat: to pyrolyse)
10
To praise or applaud (something); to promote a positive view of (something).
#dated#informal#slang