unfasten

[ uhn-fas-uhn, -fah-suhn ]
/ ʌnˈfæs ən, -ˈfɑ sən /

verb (used with object)

to release from or as from fastenings; detach.
to undo or open (something fastened).

verb (used without object)

to become unfastened.

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Origin of unfasten

First recorded in 1175–1225, unfasten is from the Middle English word unfastnen.See un-2, fasten
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for unfasten

British Dictionary definitions for unfasten

unfasten
/ (ʌnˈfɑːsən) /

verb

to undo, untie, or open or become undone, untied, or opened
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012