unbuckle

[uhn-buhk-uhl]
verb (used without object), unbuckled, unbuckling.
1.
to unfasten the buckle or buckles of.
2.
to undo a buckle.

Origin:
1350–1400; Middle English unboclen. See un-2, buckle

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To unbuckle
Example sentences
Unbuckle waist straps, use a long stick for stability, and face upstream while crossing.
To prevent being pulled under by its weight, unbuckle your pack's waist strap
  so you can shed it if you fall in.
Unbuckle the waist belt of your pack and loosen the shoulder straps.
He apparently was unable to unbuckle his lap and shoulder restraint and drowned.
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