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Definition crack up in British English

crack up phrasal verb

phrasal verb
1

to become mentally ill

Example

He just cracked up from the stress.

Synonyms and related words
2

to suddenly laugh a lot at something

Example

The girls all cracked up when they saw him.

Synonyms and related words
2.1

to make someone laugh a lot

Example

Little kids just crack me up with the things they say.

Synonyms and related words
3

used for saying that something is not as good as people say that it is

Synonyms and related words
Definition crack up in British English