Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
slip-up is a noun meaning "a minor inadvertent mistake usually observed in speech or writing or in small accidents or memory lapses etc.". It carries one recorded sense.
a minor inadvertent mistake usually observed in speech or writing or in small accidents or memory lapses etc.
Definitions, synonyms and semantic relations for slip-up come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.