Answer: unfasten

AnswerCrossword Clue
UNFASTENDetach
UNFASTENRemove the chain from, say
UNFASTENRemove, as a seatbelt
UNFASTENOpen, in a way
UNFASTENRelease
UNFASTENDisconnect
UNFASTENOpen
UNFASTENRelease, as a seatbelt
UNFASTENLet loose
unfastento become unfastened
unfastento release from a fastening
unfastento undo or open (something fastened)
unfastento release from or as from fastenings; detach