n.

1. 墜落，落下[U]
2. 垮臺，沒落，覆滅；垮臺（或沒落）的原因[U]
   The revolution brought about the downfall of the dictatorial regime.

   革命推翻了獨裁政權。

   Gambling was his downfall.

   賭博是他墮落的緣由。

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

   估計要下大雨，把傘帶上。

n.