Synonyms and related words :
amain, apace, at flank speed, double-quick, expeditiously, fast, hand over fist, hand over hand, hastily, hell for leather, hell-bent, hell-bent for election, in double time, in double-quick time, in high, in high gear, in seven-league boots, lickety-cut, on the double, post, posthaste, promptly, quick, quickly, rapidly, snappily, speedily, swiftly, trippingly, under forced draft, whip and spur, with all haste, with giant strides, with rapid strides, with speed