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crack up

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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
  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]crack someone up to make someone laugh a lot

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

See also main entry: crack

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