unbuckle

At the end of the exercise, I unbuckle the vest and dump it on the ground.

Unbuckle his reins, and buckle them on to those of the troopers.

Beautiful girls will happily unbuckle their communist suits and dress up in old silken low-necks, hired from a costumer.

Now unbuckle your gun-belt with your left hand—your left, I said!

To unbuckle them at any time was difficult; to unbuckle them in time to get one out to fire at a flying duck, was impossible.

It'll quit hurting, if you stop and stoop down and unbuckle your boot and then buckle it again.