a drop or decrease (in amount, level, etc.); going down
今年は売上がダウンしたので、対策を考えている。
Sales dropped this year, so we're thinking of countermeasures.
気温が急にダウンして、朝はかなり寒かった。
The temperature suddenly dropped, so it was quite cold in the morning.
最近、サイトの閲覧数がダウンしている原因を調べている。
We're investigating the cause of the recent drop in site views.
knocking down (in boxing) — being floored or causing a knockout
第3ラウンドで相手をダウンさせた。
He knocked his opponent down in the third round.
ダウンから立ち上がれず、試合はストップした。
He couldn't get up from the knockdown and the match was stopped.
being out of action due to illness, exhaustion, etc.; to be 'down' (e.g., with a cold or from drinking)
彼は風邪でダウンして、今日は会社を休んだ。
He was down with a cold and took the day off work.
飲みすぎて朝までダウンしていた。
He drank too much and was out of it until morning.
試合翌日、疲労で選手が数名ダウンした。
The day after the match, several players were down from exhaustion.
system or server going down; a crash (computing)
昨夜サーバーがダウンして、数時間アクセスできなかった。
The server went down last night and was inaccessible for several hours.
負荷が高くてサービスが頻繁にダウンしている。
High load is causing the service to frequently go down.
(in baseball) the number of outs (used occasionally; Japanese commonly uses 'アウト')
現在1ダウン、ランナーは一塁にいる。
It's currently one down, with a runner on first.
ツーアウトから反撃が始まった。
They started a counterattack from two outs.
being behind in points or games; being down (in a match or series)
前半で3点ダウンしてしまったが、後半に追いついた。
They were down by three in the first half, but caught up in the second half.
チームは2ゲームダウンから見事に逆転した。
The team made a remarkable comeback from being two games down.
a 'down' in American football (the unit of play/attempts, e.g., first down, fourth down)
残り2ダウンで10ヤード進まなければならない。
They have two downs left to gain 10 yards.
この場面はフォースダウンでギャンブルするしかない。
At this point it's fourth down and they have to gamble.
down (feathers) — the soft, insulating feathers of birds
この枕はダウンが入っているのでとても柔らかい。
This pillow contains down, so it's very soft.
ダウンは軽くて保温性が高い素材だ。
Down is a lightweight material with high insulating properties.
abbreviation of 'down jacket' — a padded, feather-filled winter coat
寒いからダウンを着て出かけたほうがいいよ。
It's cold, so you should go out wearing a down (jacket).
冬は薄手のセーターにダウンを重ねるのが定番だ。
In winter it's common to layer a thin sweater with a down jacket.