sparebuckler
nounUK /ˈspɛəˌbʌklə/
US /ˈspɛrˌbʌklər/
A sparebuckler is an extra shield you keep just in case yours breaks.
The knight packed a sparebuckler in his bag before the long journey.
OTHER MEANINGS
2. A person who steps in to protect someone else when needed.
Whenever the team argued, Maya was the sparebuckler who calmed everyone down.
3. A small round shield kept as a backup in a workshop or armory.
The armorer hung a sparebuckler on the wall near the door.
4. Something held in reserve to take the place of a main item that fails.
The old flashlight in the drawer was our sparebuckler during the power cut.