What is the term when a phrase means just the opposite of what it used to mean?

Solution 1:

For phrases, I'm not sure I've heard one specifically.

But for single words, like peruse, quite, cleave, I generally see the term contranym and auto-antonym. Wikipedia has a gigantic list of other terms*, but those are the two that I think will be most readily understood.

^{* antagonym, Janus word , enantiodrome, self-antonym, antilogy, addad, contronym, autantonym}

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What is the term when a phrase means just the opposite of what it used to mean?

Solution 1:

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