Buckler (noun)

1. A small round shield held by a handle or worn on the forearm, used in the Middle Ages for protection in hand-to-hand combat.
2. Something that protects or defends like a buckler, such as a person's courage or faith.

Origin:

From middle english 'bokeler' meaning a small round shield, from old french 'bocle' meaning shield or buckler, from latin 'buccula' meaning cheek or boss of a shield.

Examples:

1. The knight carried a buckler in addition to his sword to protect himself in battle.
2. The museum displayed a collection of medieval arms and armor, including bucklers of various sizes and shapes.
3. The hero used his buckler to deflect the enemy's sword and then delivered a fatal blow.
4. The singer's faith served as a buckler against the criticism and negativity of the media.
5. The athlete's determination and courage were his buckler against defeat and disappointment.