n. 25B6; adjective
a double garage 007C; double yellow lines : DUAL, duplex, twin, binary, duplicate, in pairs, coupled, twofold.
a double helping : DOUBLED, twofold.
a double meaning : AMBIGUOUS, equivocal, dual, two-edged, double-edged, ambivalent, cryptic, enigmatic.
a double life : DECEITFUL, double-dealing, two-faced, dual; hypocritical, false, duplicitous, insincere, deceiving, dissembling, dishonest.
25B6; adverb we had to pay double : TWICE (OVER), twice the amount, doubly.
if it's not her, it's her double : LOOKALIKE, twin, clone, duplicate, exact likeness, replica, copy, facsimile, Doppelgänger; informal spitting image, dead ringer, dead spit.
she used a double for the stunts : STAND-IN, substitute.
they doubled his salary : MULTIPLY BY TWO, increase twofold.
the bottom sheet had been doubled up : FOLD (BACK/UP/DOWN/OVER/UNDER), turn back/up/down/over/under, tuck back/up/down/under.
the kitchen doubles as a dining room : FUNCTION, do, (also) serve.
25A0; at/on the double VERY QUICKLY, as fast as one's legs can carry one, at a run, at a gallop, fast, swiftly, rapidly, speedily, at (full) speed, at full tilt, as fast as possible; informal double quick, like (greased) lightning, like the wind, like a scalded cat, like a bat out of hell; Brit. informal like the clappers, at a rate of knots; N. Amer. informal lickety-split.