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crack up - definition and synonyms

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phrasal verb informal
Word Forms
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present tense
I/you/we/theycrack up
he/she/itcracks up
present participlecracking up
past tensecracked up
past participlecracked up

Related words

  1. 1
    [intransitive] to become mentally ill
    He just cracked up from the stress.
  2. 2
    [intransitive] to suddenly laugh a lot at something
    The girls all cracked up when they saw him.
    1. a.
      [transitive] to make someone laugh a lot
      Little kids just crack me up with the things they say.
      Synonyms and related words
  3. 3
    something is not all it’s cracked up to be used for saying that something is not as good as people say that it is
    Synonyms and related words
See also main entry: crack

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