Originally Posted by addabox
As best I know the only word in English that is its own antonym.
I was once told some linguists has observed a tendency for a word to shift to a meaning that's opposite the original meaning. Maybe that's what we're seeing here? I also note that the chosen meaning of the word 'cleave' would depend on whehter we say 'cleave off
of' or 'cleave to'. (to think of it, I don't think anyone would try to say something that didn't attach the word to a preposition. "I am cleaved" sounds um, weird.)