CRACK UP


Meaning of CRACK UP in English

( informal )

1.

to become ill, either physically or mentally, because of pressure :

You'll crack up if you carry on working like this.

2.

to start laughing a lot :

He walked in and everyone just cracked up.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.