a figure of speech in which a term or phrase is applied to something to which it is not literally applicable in order to suggest a resemblance, as in “A mighty fortress is our God.” Compare mixed metaphor, simile(def. 1).
2.
something used, or regarded as being used, to represent something else; emblem; symbol.
Origin: 1525–35; < L metaphora < Gk metaphorá a transfer, akin to metaphérein to transfer. See meta-, -phore
A figure of speech in which a word or phrase that ordinarily designates one thing is used to designate another, thus making an implicit comparison, as in "a sea of troubles" or "All the world's a stage"(Shakespeare).
One thing conceived as representing another; a symbol: "Hollywood has always been an irresistible, prefabricated metaphor for the crass, the materialistic, the shallow, and the craven"(Neal Gabler).
[Middle English methaphor, from Old French metaphore, from Latin metaphora, from Greek, transference, metaphor, from metapherein, to transfer : meta-, meta- + pherein, to carry; see bher-1 in Indo-European roots.] met'a·phor'ic (-fôr'ĭk, -fŏr'-), met'a·phor'i·cal adj., met'a·phor'i·cal·ly adv.