If you redouble your efforts, you try much harder to achieve something. If something redoubles, it increases in volume or intensity.
例句
The president also called on nations to redouble their efforts to negotiate an international trade agreement...總統還呼吁各國就簽訂國際貿易協定加倍努力進行磋商。The applause redoubled.掌聲加倍熱烈。
英漢詞典釋義
vt. & vi.
進一步加強,大大增加
We redouble our efforts for Manhan’s release.為了解救馬漢,我們做了最大的努力。
vi.
再加倍,翻兩番
英英詞典釋義
Verb
1. double in magnitude, extent, or intensity;
"The enemy redoubled their screaming on the radio"