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.

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

If the phrase “mom jeans” makes you instantly crack up, you will love this show.

From New York Times • Feb. 8, 2024

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

From Scientific American • Feb. 14, 2023

I loved it when other hikers would crack up seeing little lap dogs deep in the backcountry.

From Seattle Times • Apr. 22, 2022

We wanted to crack up but saved that for later.

From "One Crazy Summer" by Rita Williams-Garcia