guardrelease
nounUK /ˈɡɑːd.rɪˌliːs/
US /ˈɡɑːrd.rɪˌliːs/
A guardrelease is a special button or lever that lets a guard open or let go of something safely.
The knight pulled the guardrelease to lower the castle gate.
OTHER MEANINGS
2. A tool used to free a trapped guard from a machine.
The worker used a guardrelease to free the jammed guard.
3. A signal that tells a guard it is safe to step away.
The coach gave the guardrelease so the player could leave the field.
4. A part on a helmet that lets the face guard pop open.
He pressed the guardrelease to lift the visor on his helmet.