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.
2192; headword