Unbuckle v. t. : To loose the buckles of; to unfasten; as, to unbuckle a shoe.

Example:
Why do you have to wait till the plane halts to a complete stop before you Unbuckle your seat belt?

Taxonomy
buckles, intr, WordNet, Translations, Unanswered questions, Português, 中文, Chinese, Dictionary of the English Language, Houghton Mifflin Company, Literature & Language, buck, Search, word meaning, Antonym, Dansk, Danish, Nederlands.

Defination from the web:
unbuckle v. , -led , -ling , -les . v.tr. To loosen or undo the buckle or buckles of. v.intr. To undo buckles ... WordNet: unbuckle. Top. Home > Library > Literature & Language > WordNet. Note: click on a word meaning below to see its connections and related words. ...