to double; make twice as great

to redouble one's efforts.

to echo or reecho.

Bridge . to double the double of (an opponent).

to go back over

to redouble one's footsteps.

Archaic . to repeat.

to be doubled; become twice as great.

to be echoed; resound.

Bridge . to double the double of an opponent.

Bridge . the act of doubling one's opponent's double.

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.

verb

duplicate , geminate , twin , aggravate , deepen , enhance , heighten , augment , breastwork , fort , fortification , intensify , magnify , reinforce , repeat , retrace , stronghold