unfasteners
nounUK /ʌnˈfɑːsənəz/
US /ʌnˈfæsənərz/
Things or people that open or loosen something that is closed.
The unfasteners on the seat belts made it easy for the kids to get out.
OTHER MEANINGS
2. Tools used to undo buttons, zippers, or ties.
She kept a set of unfasteners in her sewing kit.
3. People who loosen or detach things.
The unfasteners worked quickly to take down the tent.
4. Devices that release a catch or lock.
The unfasteners on the harness clicked open.