According to Pottermore, in the Harry Potter world, swears aren’t meant to offend so much as they are to add emphasis—though Mrs. Weasley might argue otherwise.
Mistakes in the Harry Potter books, Harry Potter Wiki
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Me? No, I'm just a worm — Un-censoring the swear words Ron used in the books
5 Harry Potter Swear Words You Might Have Missed
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Should Hermione say a word? Or should she have Snape's word on this?
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Harry Potter swear words?