Definitions

1. verb

to loosen or remove a fastening, especially a knot, buckle, or other device that holds something in place

“She tried to unfasten her shoes, but they were stuck to the mud.”

2. verb

to release or remove a restraint or obstacle

“The doctor had to unfasten the patient’s oxygen mask to examine the wound.”

3. verb

to remove the fastening or covering of something

“The mechanic had to unfasten the battery to replace it.”

4. noun

the act of loosening or removing a fastening

“The unfastening of the seatbelt was a crucial step in escaping the wreckage.”