re double

redouble

[ree-duhb-uhl]
verb (used with object), redoubled, redoubling.
1.
to double; make twice as great: to redouble one's efforts.
2.
to echo or reecho.
3.
Bridge. to double the double of (an opponent).
4.
to go back over: to redouble one's footsteps.
5.
Archaic. to repeat.
verb (used without object), redoubled, redoubling.
6.
to be doubled; become twice as great.
7.
to be echoed; resound.
8.
Bridge. to double the double of an opponent.
noun
9.
Bridge. the act of doubling one's opponent's double.
10.
Fencing. an attack in a line other than that of the previous attack, made after the failure of the opponent to follow his or her parry of the previous attack with a riposte.

Origin:
1470–80; < Middle French redoubler. See re-, double

redoubler, noun

redouble, reduplicate.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
redouble (rɪˈdʌbəl)
 
vb
1.  to make or become much greater in intensity, number, etc: to redouble one's efforts
2.  to send back (sounds) or (of sounds) to be sent back; echo or re-echo
3.  bridge to double (an opponent's double)
 
n
4.  the act of redoubling

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

redouble
c.1443, from M.Fr. redoubler, from O.Fr. re- "again" + doubler (see double).
Online Etymology Dictionary, © 2010 Douglas Harper
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