One-downing is simply the opposite of one-upping.

Also known as a "race to the bottom." This tactic is used by everyone from fast food produces, horror movie directors, indeed the President of the United States of America, to shock people by showing them that the bar can still be lowered.
While many fast food producers are scrambling to one-up each with healthy offerings, KFC is one-downing them all the with the double down sandwich.
by SearchFHG June 13, 2018
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Wen you breeze one down, then u r a little legend, it means to have a poo poo!
"breeze one down u little legend, scat judge g unit nigwoar!
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