motionstopper
nounUK /ˈməʊʃənˌstɒpə/
US /ˈmoʊʃənˌstɑpər/
A motionstopper is something that makes a moving thing stop.
The motionstopper on the door kept it from swinging shut.
OTHER MEANINGS
2. A device or substance that halts mechanical movement.
The engineer installed a motionstopper to keep the conveyor belt from running backward.
3. A person who brings an activity or process to a halt.
The referee acted as a motionstopper, pausing the game for a foul.
4. In gaming, an item or ability that freezes an opponent in place.
She used a motionstopper spell to trap the monster for three turns.
5. A safety feature that prevents a machine from continuing to operate.
The motionstopper cut the power as soon as the guard was lifted.