One of the mysteries of the English language finally explained.
1‘Charlie disappeared across the parade ground at the double’
very quickly, as fast as one's legs can carry one, at a run, at a gallop, hotfoot, on the double, fast, swiftly, rapidly, briskly, speedily, at high speed, with all speed, at speed, at full speed, at the speed of light, at full tilt, express, post-haste, as fast as possible, with all possible haste, like a whirlwind, like an arrow from a bow, at breakneck speed, expeditiously, madly, with dispatch
informal double quick, in double quick time, p.d.q., p.d.q. pretty damn quick, nippily, like lightning, like greased lightning, at warp speed, hell for leather, like mad, like crazy, like blazes, like the wind, like a bomb, like nobody's business, like a scalded cat, like the deuce, a mile a minute, like a bat out of hell
British informal like the clappers, at a rate of knots, like billy-o
North American informal lickety-split
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