silver-bullet

silver bullet

noun
a quick solution to a difficult problem.

Origin:
1930–35; from the belief that supernatural beings, as werewolves, can be killed with a silver bullet

magic bullet, silver bullet.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Etymonline
Word Origin & History

silver bullet
"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 (e.g. Delphic Oracle's advice to Philip of Macedon).
Online Etymology Dictionary, © 2010 Douglas Harper
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