mid-15c., "double again, multiply" (trans.), from Middle French redoubler, from Old French re- "again" (see re-) + doubler "to double" (see double (v.)). Meaning "become twice as much" (intrans.) is from late 15c. Related: Redoubled; redoubling.
The enemy redoubled their screaming on the radio
The noise doubled and redoubled
The screaming redoubled
redneck
redness
redo
redolence
redolent
redouble
redoubt
redoubtable
redound
redox
redress
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