vt.

1. 缩回，缩进（爪，舌等）
   A cat can retract its claws.

   猫能缩进爪子。

2. 撤回，收回（声明，诺言等）

vi.

1. 缩回，缩进
2. 撤销，收回

v.

1. draw or be drawn back or back in.
2. withdraw (a statement or accusation) as untrue or unjustified.
   ▸withdraw or go back on (an undertaking).