any simple but sweeping solution to a complex or virtually insurmountable problem: the legislation was no silver bullet for crime
See silver bullet in American Heritage Dictionary 4
noun
An infallible means of attack or defense.
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).
Origin:
Origin: From the belief that werewolves could be killed with silver bullets