vt.

1. 使加倍；大大增加，加强
   The army redoubled its attack.

   军队进一步加强了攻势。

   Bob redoubled his efforts.

   鲍伯加倍努力。

2. 把……再折叠
3. 循着……折回；使（声音）折回
   redouble one's footsteps

   循着自己的脚印往回走

4. 【古】再次重复

vi.

1. 加倍；大大增加，加强
   Their zeal redoubled.

   他们的热情更高了。

2. 回响，反响；回荡
3. 急速折回[（+on）]
4. （桥牌中）再加倍

n.[C]

1. 倍增
2. （桥牌中的）再加倍

v.

1. make or become much greater or more intense or numerous.
2. Bridge  double a bid already doubled by an opponent.

n.