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Definitions

crack up

VERB
break down mentally
Synonyms
STRONGEST
freak out go crazy
WEAK
become demented become psychotic blow a fuse collapse come apart at seams decline derange deteriorate fail flip out go bonkers go nuts go off deep end go off rocker go out of mind go to pieces have breakdown sicken
Antonyms
WEAK
be calm
VERB
crash or wreck a car, plane, etc.
Synonyms
STRONGEST
crash wreck
WEAK
impact
VERB
laugh or to cause to laugh unrestrainedly
Synonyms
STRONGEST
laugh make laugh
STRONG
amuse cackle chortle chuckle entertain giggle guffaw roll in the aisles snicker snigger split one's sides titter
WEAK
wow
Antonyms
STRONG
cry

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Padilla and Gosling were a teacher and principal in another sketch reading passed notes out loud that, according to text on screen, were swapped out since rehearsal, causing both to crack up uncontrollably.

From Los Angeles Times • Mar. 8, 2026

It's not clear what made him crack up, but we bet Paul Giamatti had something to do with it.

From BBC • Feb. 13, 2024

She is also the person who, her castmates said, makes David crack up most regularly.

From New York Times • Feb. 1, 2024

Developers first drill a well and inject high-pressured water to crack up underground rock.

From Scientific American • Feb. 14, 2023

So many things made me crack up that I was always bursting into laughter in class.

From "Courage to Soar" by Simone Biles