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Meaning ofcrack upin English

crack up

Definitions

Verb
1. to laugh heartily; find something amusing
  The audience began to crack up at the comedian's jokes.
2. to break down mentally; suffer a breakdown
  After months of stress, she started to crack up and needed a break.
3. to shatter; fall apart physically
  The old vase began to crack up and eventually fell apart.
Adjective
1. extremely funny; highly amusing
  The movie was so crack up that I couldn't stop laughing.

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