What does crack up mean?

phrv. to become unable to think or behave in a normal way because of too much stress or worry

crack up

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Tags CEFR-C2

phrase verb

to become unable to think or behave in a normal way because of too much stress or worry

After working 80 hours a week for months, he finally started to crack up.

to become unable to think or behave in a normal way because of too much stress or worry