Contranym
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A contranym is a word that can be its own opposite.
Contranyms — like a heteronym, portemanteau, palindrome and semordnilap — 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.
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.”
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