"unfastening" in the noun sense
1. untying, undoing, unfastening
loosening the ties that fasten something the untying is easy"
"the tying of bow ties is an art
"unfastening" in the verb sense
1. unfasten
cause to become undone
"unfasten your belt"
2. unfasten
become undone or untied
"The shoelaces unfastened"
Source: WordNet® (An amazing lexical database of English)
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