like a shot

Từ điển WordNet v3.1 - WordNet Dictionary

adverb

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
• Derived from adjective:
immediate (for: immediately)