frozen_metaphor
1. [ noun ] (rhetoric) 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')
Synonyms: dead_metaphor
Related terms: metaphor
Similar spelling:   frozen_dessert
  frozen_custard
  frozen_yogurt