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muck up

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phrasal verb informal
Word Forms
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present tense
I/you/we/theymuck up
he/she/itmucks up
present participlemucking up
past tensemucked up
past participlemucked up
  1. 1
    [intransitive/transitive] to not deal with something well or skillfully so that you do not achieve what you intended

    I couldn't take the risk of mucking up my chances.

  2. 3
    [transitive] to make something dirty or messy

    Don't muck up the clean floor.

See also main entry: muck

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