Today I learnt about contronyms – words that have two meanings that are the opposite of each other. I’d seen a post on reddit about interesting words you might know, and one of the comments listed the otherwise unremarkable word unlockable, but also added the two meanings. At that point everything fell into place and many more words were listed by other commenters: shelled, clipped, dust (as a verb).
Of course, reddit being reddit, a debate started whether the two definitions of unlockable where actually the opposite of each other:
Definition 1: Incapable of being locked.
Definition 2: Capable of being unlocked.
Today I learned: Contronyms.