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redouble (v.)

mid-15c., redoublen, "double (something) again or repeatedly, multiply" (transitive), from Old French redobler, redoubler, from re- "again" (see re-) + doubler "to double" (see double (v.)). Intransitive meaning "become twice as much" is from late 15c. Related: Redoubled; redoubling.

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Definitions of redouble from WordNet

redouble (v.)
double in magnitude, extent, or intensity;
The enemy redoubled their screaming on the radio
redouble (v.)
double again;
The noise doubled and redoubled
redouble (v.)
make twice as great or intense;
The screaming redoubled
From wordnet.princeton.edu