re·dou·ble /(ˌ)riˈdʌbəl/
 (v.)加倍;加強;反覆;反響


 Re·dou·ble, v. i. To become greatly or repeatedly increased; to be multiplied; to be greatly augmented; as, the noise redoubles.

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 Re·dou·ble v. t.  To double again or repeatedly; to increase by continued or repeated additions; to augment greatly; to multiply.
 So they
 Doubly redoubled strokes upon the foe.   --Shak.


 redouble
      v 1: double in magnitude, extent, or intensity; "The enemy
           redoubled their screaming on the radio"
      2: double again; "The noise doubled and redoubled"
      3: make twice as great or intense; "The screaming redoubled"