n.

1. 坠落，落下[U]
2. 垮台，没落，覆灭；垮台（或没落）的原因[U]
   The revolution brought about the downfall of the dictatorial regime.

   革命推翻了独裁政权。

   Gambling was his downfall.

   赌博是他堕落的缘由。

3. 大阵雨（或雪）[C]
   A downfall is expected, so take an umbrella.

   估计要下大雨，把伞带上。

n.