fall, decrease, drop, going down, knocking down, flooring, being knocked down, being floored, being out of action (due to illness, exhaustion, etc.), being down (e.g. with a cold), being knocked out (from alcohol), being out of it, collapsing, going down (of a computer system, server, etc.), crashing, (number of) outs, being down (in points, games, etc.), being behind, trailing, down (in American football), down (feathers)