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Verb: slip up
  1. Make an error
    "She slipped up and revealed the name";
    - stumble, trip up
Noun: slip-up  'slip,úp
  1. A minor inadvertent mistake usually observed in speech or writing or in small accidents or memory lapses etc.
    - slip, miscue, parapraxis

Derived forms: slips up, slipped up, slip-ups, slipping up

See also: slip

Type of: err, error, fault, mistake, slip