vt.

1. 使变硬，使变挺
   a shirt with a stiffened collar

   硬领衬衫

2. 使僵硬，使僵直
3. 使顽强，使坚定；使强硬
   You will only stiffen his resolve.

   你只会坚定他的决心。

4. 使严厉，使严格
5. 使生硬，使呆板
6. 使变稠；使变稠粘
7. 使上升；使坚挺

vi.

1. 变硬，变挺
2. 变僵硬
3. 变强硬；变坚定
   Resistance stiffened even further last week.

   上星期抵抗进一步加强了。

4. 变生硬；变古板
5. 变稠；变稠粘
6. 变坚挺

v.

1. make or become stiff.
2. make or become stronger or more steadfast.