Hi Ckinkey-- welcome to English Forums. A metaphor is 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). 2.
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CalifJimAnd just to underscore it, that phrase is a metaphoric utterance only when it is not meant to be descriptive of the actual thermostatic reading in the room, (which could, I suppose, go up [to 98.6 degrees] if the arguing person's cannot stop arguing.)
Metaphoric Utterance: It's getting hot in here.