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Something that provides an immediate and extremely effective solution to a given problem or difficulty, especially one that is normally very complex or hard to resolve. The phrase is almost always used in a statement that such a solution does not exist. There's no silver bullet that will solve the homelessness crisis in this country. The way to make progress is through deliberate, logical discussions around the issue.
silver bulletand magic bullet
n. a specific, fail-safe solution to a problem. (From the notion that a bullet made of silver is required to shoot a werewolf.) I’m not suggesting that the committee has provided us with a silver bullet, only that their advice was timely and useful. I don’t know the answer. I don’t have a magic bullet!
A highly accurate projectile of death or destruction. Sir Walter Scott may have been the first to use the idea of a literal silver bullet in Lockhart (1808), “I have only hopes that he will be shot with a silver bullet.” The term caught on in the first half of the 1900s because the popular western hero of the radio program, The Lone Ranger, used a silver bullet. During the Korean War an antiaircraft shell that hit precisely on target was called “silver bullet.” By the late 1900s the term also was being used figuratively, as in, “We’re hoping our new software will be the silver bullet to put the company on the map.”