What is the euphemism treadmill?

I heard about this idea a while back called the euphemism treadmill. I thought I should share this idea and perhaps explore some of the implications concerning concepts that seem to be riding it.

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NOTE: YouTube appears to be arbitrarily deleting some comments. I will receive a notification that you made a comment, but the comment itself may simply never show up. I do not know why some comments are allowed and not others. I cannot do a thing about this. I'm sorry. ... https://www.youtube.com/watch?v=xz4Vr93EUks