Down is the fine undercoat of birds under the feathers, and is often used as insulation in clothing. Mammals have an undercoat called downhair.
Down, used in American football, is a stage of play; four downs are allowed in a "possession"; three downs are allowed in Canadian football. The reference is to the ball or ball carrier being brought to a halt, often by being knocked down.
Down is a colloquial synonym for depressed or blue.
A computer (or other) system can go down when it essentially loses power or crashes.
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