Why do we say “OK”? It’s hard to believe there was ever a time when some words didn’t exist. Had you been around before 1839, for instance, you wouldn’t have had a clue what OK means because OK wasn’t a thing yet! It's easily one of the most widely-used expressions around the world. It isn’t confined to one region, language, or even purpose!  You use it to show that you got the message, like when your boss says, “Hey, I need you to send me a copy of that report” and you reply, “OK!” Yet if you think that something was just mediocre, you say, “Eh, the movie was OK.” 

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