What does it mean when something's "pickled"?

All the time, foods are "pickled", like pickled onions or...well, something else pickled. What does that mean, the food sits in pickle juice until it has a bit of pickle flavor? I don't get it, can someone explain? Thanks for answering and serious answers only please, or you better hope I can't... show more All the time, foods are "pickled", like pickled onions or...well, something else pickled. What does that mean, the food sits in pickle juice until it has a bit of pickle flavor? I don't get it, can someone explain? Thanks for answering and serious answers only please, or you better hope I can't contact you because you'll be getting a rant. 10 points, don't forget!
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