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
take a liking to (someone or something)
to develop a fondness or a preference for someone or something
I took a liking to my new neighbor immediately.