1. Become much greater in intensity, size or amount
   "we faced redoubled attacks from the enemy"; "despite our redoubled efforts"

1. Make twice as great or intense
   "The screaming redoubled"
    
2. Double again
   "The noise doubled and redoubled"
    
3. Double in magnitude, extent, or intensity
   "The enemy redoubled their screaming on the radio"

See also: increased

Type of: deepen, double, duplicate, escalate, intensify, step up

Encyclopedia: Redouble