Unstrap (verb)

1. To unfasten or to unsecure something with a strap.
2. To remove or to detach something by releasing a strap.

Origin:

From the combination of prefix "un-" meaning not and the verb "strap" meaning to fasten or secure with a strap.

Examples:

1. He unstrap the watch from his wrist.
2. She unstrap the bag from her shoulder.
3. The child unstrap the helmet from his head.
4. The diver unstrap the tanks from his back.
5. The patient unstrap the bandage from his arm.