unbuckle

American  

[uhn-buhk-uhl] / ʌnˈbʌk əl /

verb (used without object)

unbuckled, unbuckling

1. to unfasten the buckle or buckles of.

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verb (used without object)

unbuckled, unbuckling

1. to undo a buckle.

Etymology

Origin of unbuckle

First recorded in 1350–1400, unbuckle is from the Middle English word unboclen. See un- ², buckle

Explanation

To unbuckle is to release a belt or clasp — to unfasten. You're going to have to unbuckle your seat belt before you get out of the car. The verb unbuckle adds the prefix un- (""reverse of") to buckle, which stems from the Latin word buccula, "cheek strap of a helmet." So just as you buckle your helmet before you jump on your bike, you unbuckle it once you arrive at your friend's house.

Example Sentences

"I managed to unbuckle myself, used my leg to push through that opening, and crawled out," Vishwashkumar Ramesh told Indian state media DD News.

From BBC • Jun. 13, 2025

After crossing in complete silence, he turned and told me to unbuckle the straps on my pack and follow exactly in his footsteps.

From Los Angeles Times • Jun. 9, 2023

The door opens and Allan can be seen moving, although it’s unclear whether he’s trying to unbuckle his seatbelt or access the holster.

From Seattle Times • Mar. 8, 2023

When they got to Feighan’s apartment, the younger man went to unbuckle his seatbelt, only to have the partner throw his arm across his chest to hold him down.

From The Verge • Aug. 10, 2021

When he ventured to unbuckle the cumbersome sword, Eilonwy opened one eye, made an irritated face, and pulled the blade away from him—with more determination than he had expected.

From "The Book of Three" by Lloyd Alexander