at the double

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• at running speed; very fast.

• "he disappeared at the double"

Similar: very quickly, at a run, at a gallop, hotfoot, on the double, fast, swiftly, rapidly, briskly, speedily, at high speed, with all 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, double quick, in double quick time, p.d.q. (pretty damn quick), nippily, 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, like the clappers, at a rate of knots, like billy-o, lickety-split, apace,