shield -
A sign or symbol, usually containing numbers and sometimes letters, identifying a highway route.
Verb
shield -
To protect, to defend.
shield -
To protect from the influence of.
Wikipedia
A shield is a type of personal armor, meant to intercept attacks, either by stopping projectiles such as arrows or by glancing a blow to the side of the shield-user. Shields vary greatly in size, ranging from large shields that protect the user's entire body to small shields that are mostly for use in hand-to-hand combat. Shields also vary a great deal in thickness; whereas some shields were made of thick wooden planking, to protect soldiers from spears and crossbow bolts, other shields were thinner and designed mainly for glancing blows away (such as a sword blow).
OmegaWiki Dictionary
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shield A large plate made of metal or wood, held in the left hand during melee combat to protect the body from incoming attacks.
shield To protect, hide, or conceal from danger or harm.
shield A shielding or protection against the unpleasant, unwanted, or dangerous.