Wordnet 3.0
ADVERB (1)
1. 
 without delay or hesitation; 
 with no time intervening; 
- Example: "he answered immediately"- Example: "found an answer straightaway"- Example: "an official accused of dishonesty should be suspended forthwith"- Example: "Come here now!"[syn: immediately, instantly, straightaway, straight off, directly, now, right away, at once, forthwith, like a shot]
WordNet (r) 3.0 (2006):
like a shot
    adv 1: without delay or hesitation; with no time intervening;
           "he answered immediately"; "found an answer
           straightaway"; "an official accused of dishonesty should
           be suspended forthwith"; "Come here now!" [syn:
           immediately, instantly, straightaway, straight
           off, directly, now, right away, at once,
           forthwith, like a shot]