vi.

1. （月）虧，缺
   Don't be sad. The moon will become full after it wanes.

   不要傷感。月缺以後會有滿月。

2. 變暗淡；變小；減少
   My interest in the problem waned.

   我對那個問題的興趣減弱了。

3. 衰落；沒落；消逝
   When did the empire begin to wane?

   那個帝國何時開始衰落的？

4. 退潮

n.[U]

1. 月虧；月虧期
   The moon is on the wane.

   月亮漸虧。

2. 衰退；衰退期
   His fortune is on the wane.

   他命運不濟了。

v.

1. (of the moon) have a progressively smaller part of its visible surface illuminated, so that it seems to decrease in size.
2. become weaker.

n.