Increase by a factor of two.

Roget 90: duplication; doubling etc. v.; gemination, ingemination^†; reduplication; iteration etc. (repetition) 104; renewal.   

Roget 702: cunning, craft; cunningness^†, craftiness etc. adj.; subtlety, artificiality; maneuvering etc. v.; temporization; circumvention.    chicane, chicanery; sharp practice, knavery, jugglery^†; concealment etc. 528; guile, doubling, duplicity etc. (falsehood) 544; foul play.    diplomacy, politics; Machiavelism; jobbery, backstairs influence.    art, artifice; device, machination; plot etc. (plan) 626; maneuver, stratagem, dodge, sidestep, artful dodge, wile; trick, trickery etc. (deception) 545; ruse, ruse de guerre [Fr.]; finesse, side blow, thin end of the wedge, shift, go by, subterfuge, evasion; white lie etc. (untruth) 546; juggle, tour de force; tricks of the trade, tricks upon travelers; espieglerie [Fr.]; net, trap etc. 545.    Ulysses, Machiavel, sly boots, fox, reynard; Scotchman; Jew, Yankee; intriguer, intrigant^†; floater [U.S.], Indian giver [U.S.], keener [U.S.], repeater [U.S.].    ... show more

Polish: dublowanie, podwajanie, zdwajanie

Raising the stakes in a card game by a factor of 2.

synonym: double.

Roget 258: fold, plicature^†, plait, pleat, ply, crease; tuck, gather; flexion, flexure, joint, elbow, double, doubling, duplicature^†, gather, wrinkle, rimple^†, crinkle, crankle^†, crumple, rumple, rivel^†, ruck^†, ruffle, dog's ear, corrugation, frounce^†, flounce, lapel; pucker, crow's feet; plication^†.    ... show more