Just recently I was in a conversation with a number of UK mainlanders and we had a debate over what "tories" meant, apparently disproportionately ordinarily it refers to a political party and it's not usual to use it as short for "territories" as I've used it (according to how the debate ended, it was half and half between them). And once again I'm reminded of how people feel to look back at their usage of a word/phrase over the years and cringe.
More tragically, me and a friend were embarrassed once upon realizing everyone was confusing "encephalitis" with "hydrocephalus" when talking to someone about their kid with hydrocephalus. Awkward because encephalitis is caused by HIV.
ages ago, i spent something like half a year thinking there was a word "appericate". it was an odd one, since i only ever saw it in print, and from context it was clear that it meant the same thing as "appreciate", which, oddly enough, i only ever heard in speech.
and then one day i stopped at an "appericate" in a book and re-read it 9 times, very slowly.
I bet you apericated that decision.