Etymology
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silver bullet (n.)

"very effective, almost magical remedy," 1808. The belief in the magical power of silver weapons to conquer foes goes back at least to ancient Greece (as in Delphic Oracle's advice to Philip of Macedon).

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Definitions of silver bullet

silver bullet (n.)
a simple guaranteed solution for a difficult problem;
no silver bullet can make the world safe from terrorism
From wordnet.princeton.edu