fastguard
nounUK /ˈfɑːstɡɑːd/
US /ˈfæstɡɑːrd/
A fastguard is a person or thing that keeps someone safe very quickly.
The fastguard rushed to the gate to stop the stranger.
OTHER MEANINGS
2. A protective device that works very fast.
The fastguard on the machine stopped it before anyone got hurt.
3. A quick-moving escort who travels with someone.
A fastguard rode beside the queen's carriage.
4. A sports player who quickly blocks the other team.
Our fastguard blocked the shot just in time.