EnglishMerriam-Webster Dictionary
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b : lower in price
c American football : not being in play because of wholly stopped progress or because the officials stop the play //The ball was down.
d : defeated or trailing an opponent (as in points scored) //down by two runs
e baseball : out //two down in the top of the third inning 2 a : reduced or low in activity, frequency, or intensity //a down economy
b : not operating or able to function //The computer is down.