unfasten

American  

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

verb (used with object)

1. to release from or as from fastenings; detach.

2. to undo or open (something fastened).

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verb (used without object)

1. to become unfastened.

unfasten British  

/ ʌnˈfɑːsən /

verb

1. to undo, untie, or open or become undone, untied, or opened

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Etymology

Origin of unfasten

First recorded in 1175–1225, unfasten is from the Middle English word unfastnen. See un- ², fasten

Explanation

When you unfasten something, you loosen or open it. You should wait to unfasten your seatbelt until the car has completely stopped. To fasten is to hook, close, or latch something, and to unfasten it is to undo it. You might unfasten your dog's leash so she can run free on the beach or unfasten the snaps and buttons on your jacket so you can take it off. You can also unfasten your ponytail, letting your hair down, or unfasten the latch on a gate. The Old English root word is fæstnian, "make fast or firm."

Example Sentences

Unfasten your top button and start polishing the brass buttons on your blazer.

From BBC • Aug. 19, 2014

Unfasten the dogs, and be sure you hang up the harness out of their reach, or the puir hungry wratches will eat it up, every snap, afore morning.

From Wilson's Tales of the Borders and of Scotland Volume 12 by Various

"Unfasten the clasp!" exclaimed the king, in a thundering voice, no longer able to conceal his rage.

From Henry VIII and His Court by Pierce, Henry Niles

"Unfasten your horse's bridle," said Necessity, when the Prince had done, "and I will soon teach him where to find something to feed upon."

From Young Folks Treasury, Volume 3 (of 12) Classic Tales and Old-Fashioned Stories by Mabie, Hamilton Wright

"Unfasten the hatches, and let them save themselves."

From The Plowshare and the Sword A Tale of Old Quebec by Trevena, John