Unbuckle (verb)

To undo or unfasten a buckle.

Origin:

From the word buckle meaning "to fasten with a buckle" and the prefix un- meaning "to undo or unfasten".

Examples:

1. He unbuckled his belt before sitting down.
2. She unbuckled the child's car seat.
3. I unbuckled my shoes before going for a walk.
4. He unbuckled the straps of his backpack.
5. She unbuckled the clasp of her necklace.