vt.

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

   軍隊進一步加強了攻勢。

   Bob redoubled his efforts.

   鮑伯加倍努力。

2. 把……再摺疊
3. 循著……折回；使（聲音）折回
   redouble one's footsteps

   循著自己的腳印往回走

4. 【古】再次重複

vi.

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

   他們的熱情更高了。

2. 回響，反響；回蕩
3. 急速折回[（+on）]
4. （橋牌中）再加倍

n.[C]

1. 倍增
2. （橋牌中的）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.