Webster's English Dictionary

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redouble

re.dou.ble \(')re--'d*b-*l\ vt 1: to make twice as great in size or amount 
   : INTENSIFY  obs  2a: to echo back  archaic  2b: REPEAT  1: to become 
   redoubled  archaic  2: RESOUND  3: to double again  4: to double an 
   opponent's double in bridge  - redouble n