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Adverb: like a shot
Usage: informal
  1. Without delay or hesitation; with no time intervening
    "he answered like a shot";
    - immediately, instantly, straightaway, straight off, directly, now, right away, at once, forthwith, right now, right off the bat [N. Amer, informal], instantaneously, outright, in a flash, tout de suite

See also: then and there