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Pawns are the lowest-ranking chess piece, yet can still be strategically valuable. Hence, to say someone is a “pawn” suggests they have little real power and are being used by others in some larger plan.
In chess, a king is “checked” or “put in check” when threatened with immediate capture, such that the checked player’s next possible moves become very limited. A person is said to be “put in check” or “checked” when corrected, controlled, or stopped, a term that seems to derive directly from chess.
If the threatened player fails to get out of check, that king is “checkmated,” a term derived from “shah mat,” which translates to “the king died” (Arabic) or “the king is stumped, helpless” (Persian).