vt.

1. 削弱，减弱；减少
   We never weaken our efforts in face of difficulties.

   我们在困难面前从不松劲。

2. 使变弱；使变淡

vi.

1. 变弱；变衰弱
   His sense of duty never weakens.

   他的责任感从不会减弱。

2. 变软弱；畏缩；动摇

v.