silver bullet

silver bullet

n.

1. An infallible means of attack or defense.

2. A simple remedy for a difficult or intractable problem: "There is no single silver bullet or panacea that will solve all the problems of Bay Area schools" (San Francisco Chronicle).

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[From the belief that werewolves could be killed with silver bullets.]

Thesaurus

Noun

1.

silver bullet - a simple guaranteed solution for a difficult problem; "no silver bullet can make the world safe from terrorism" solution - a method for solving a problem; "the easy solution is to look it up in the handbook"