Definition of double-quick in English:

double-quick

adverb & adjective

informal
  • Very quick or quickly.

    [as adjective] ‘I got changed in double-quick time’
    [as adverb] ‘you get upstairs double-quick!’
    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
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Pronunciation:

double-quick

/ˌdəbəlˈkwik/