Pronunciation change

Verb change

Plain form
unfasten

Third-person singular
unfastens

Past tense
unfastened

Past participle
unfastened

Present participle
unfastening

  1. (transitive) If you unfasten something, it means that you are detaching it from another thing; to disconnect.
  2. (intransitive) If you are unfastening a rope, it means that you are loosening or untying it.