silver bullet

a quick solution to a difficult problem.

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

magic bullet, silver bullet. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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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Computing Dictionary

silver bullet definition

magic bullet

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
If you're going to do something about climate change, there is not one silver
There is no silver bullet to improving sustainability in gemstone mining and
  the trade.
Instead he tries to focus on the government intervention in business sector as
  the silver bullet.
Vaccination is not a silver bullet against avian influenzas in poultry.
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