A polite response to thanks, meaning the favor or help was no trouble and requires no acknowledgment.
This phrase developed in the 18th century as a way to deflect gratitude by suggesting the helpful act was so minor it doesn't deserve to be 'mentioned' or discussed. It reflects social customs around modesty and downplaying one's good deeds.
This response creates an interesting social paradox - by saying 'don't mention it' after someone has already mentioned it (by thanking you), you're politely erasing their gratitude while simultaneously acknowledging it. It's a linguistic way of maintaining social harmony while appearing modest.
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