Hello, You can use " double " as a verb when making quantity of something twice as much as it was before. i.e.) I'll go into the casino and double.
2= double,3= triple, 4 = quadruple, 5= quintuple, 6= sextuple, 7 = septuple 8 = octuple .. This is a possible synonym, if you are looking for one.
Single (1) (also: singleton, sole, only, etc.) Double (2) (also: pair, twice) Triple (3) (also: triplet, treble, thrice, threesome, troika, trio) Quadruple.