Antiphrasis
Encyclopedia
An antiphrasis is a figure of speech
Figure of speech
A figure of speech is the use of a word or words diverging from its usual meaning. It can also 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 in it, as in idiom, metaphor, simile,...

 in which a word or phrase is used to mean the opposite of its usual sense, especially ironically
Irony
Irony is a rhetorical device, literary technique, or situation in which there is a sharp incongruity or discordance that goes beyond the simple and evident intention of words or actions...

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