Contranym
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A word that can be its own opposite. I learned this from Kathryn Schulz’ excellent article, What part of “No, totally” don’t you understand , about how “no, totally” came to mean “yes.” Contranyms — like heteronyms, portemanteaus, palindromes, and semordnilaps — are neat things to look out for. Like how you can dust something to pick up dust from a surface, and dust that surface to remove dust from it. So versatile. Or perhaps confusing.
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