unfasten
1.
(
verb
) become undone or untied; "The shoelaces unfastened"
Related Words:
open
,
open up
Antonyms:
fasten
2.
(
verb
) cause to become undone; "unfasten your belt"
Related Words:
unbend
,
unchain
,
undo
,
unzip
Antonyms:
fasten
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