unfasten

Definition of Unfasten in English :

1. unfasten

cause to become undone

Example Sentences:
'unfasten your belt'

2. unfasten

become undone or untied

Example Sentences:
'The shoelaces unfastened'

WordNet Lexical Database for English. Princeton University. 2010.

Unfasten

verb

to undo, untie, or open or become undone, untied, or opened

verb transitive

1.

to open or make loose; untie, unlock, undo, etc.

verb intransitive

2.

to become unfastened

v. un·fas·tened, un·fas·ten·ing, un·fas·tens

v.tr.

To separate the connected parts of.

v.intr.

To become loosened or separated.