Figure of Speech

A figure of speech or rhetorical figure^[1] is figurative language in the form of a single word or phrase. It can be a special repetition, arrangement or omission of words with literal meaning, or a phrase with a specialized meaning not based on the literal meaning of the words.^{[dubious – discuss]} Figures of speech often provide emphasis, freshness of expression, or clarity. However, clarity may also suffer from their use, as any figure of speech introduces an ambiguity between literal and figurative interpretation.

https://en.wikipedia.org/wiki/Figure_of_speech 

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