silver bullet

US /ˈsɪl.vər ˈbʊl.ɪt/
UK /ˈsɪl.vər ˈbʊl.ɪt/
"silver bullet" picture
1.

a magical solution to a difficult problem

:
There's no silver bullet for solving poverty; it requires a multifaceted approach.
Everyone is looking for a silver bullet to fix the economy, but it's more complex than that.