to release from or as from fastenings; detach.
to undo or open (something fastened).
to become unfastened.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use unfasten in a sentence
We unfasten the screws on one of the exterior panels before entering the shipping container, which I am surprised to learn is actually a modular server cluster.
They also began to strip off their shirts and unfasten their vests.
Ando put his hand out quickly behind him, seized the long roll tied in yellow cloth, and began to unfasten it.The Dragon Painter | Mary McNeil Fenollosa
Dick Harvey had fixed it beyond the skill of that skilful mechanician to unfasten.Jack Harkaway's Boy Tinker Among The Turks | Bracebridge Hemyng
Señor Rhodes will be pleased to unfasten those heavy chains to oblige the lady.The Treasure Trail | Marah Ellis Ryan
British Dictionary definitions for unfasten
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