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

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

See also: slip

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