n.
1.a metaphor that has occurred so often that it has become a new meaning of the expression (e.g., `he is a snake' may once have been a metaphor but after years of use it has died and become a new sense of the word `snake')
Idiom of the Day
turn the trick
to bring about the result that one wants, to succeed in what one plans to do
"That will turn the trick," I said as my friend found the correct tool to fix the kitchen sink.