n.[U]

1. 落潮，退潮
   They started sailing on the ebb.

   他们于退潮时出航了。

2. 衰退，衰落
   The scandal brought his credibility to its lowest ebb.

   那件丑闻使他的信誉跌到最低点。

vi.

1. 落潮，退潮
2. 衰退，衰落[（+away）]
   Our hope of winning began to ebb in the third round.

   比赛进入第三回合时我们打赢的希望变得渺茫了。

n.

v.

1. (of tidewater) move away from the land; recede. Compare with flow.
2. (often ebb away) (of an emotion or quality) gradually decrease.