in a flash

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in a flash (not comparable)

  1. (idiomatic) Instantaneous, very quick, in a very short amount of time.
    • 1987, “Sri Ramanasramam Charities”, in Mountain Path[1], volume 24, page 152:
      Therefore its completeness, though instantaneous, was total. His realisation was in a flash, but it did not vanish like a flash.
    Synonyms: fulgurant, fast as lightning, lightning fast, lightning-quick, quick as a flash


in a flash (not comparable)

  1. (idiomatic) Very quickly.
    It happened so fast that it was all over in a flash.
    Synonyms: quick as a flash, lightning fast