silver bullet
Pronunciation:
noun
Definitions
A bullet made of silver, usually with reference to the folkloric belief that such bullets are the only weapons which can kill a werewolf.
Any straightforward solution perceived to have great effectiveness or bring miraculous results.
Example: There is no silver bullet for this problem. It will take hard work and long hours to fix.
A cocktail somewhat like a martini.
A thermometer, especially one used for rectal temperature readings.
Example: The corpsman hit the marine with the silver bullet after he'd passed out on a march.