Jack Robinson

noun
🔊/ˌdʒæk ˈrɒbɪnsən/
🔊/ˌdʒæk ˈrɑːbɪnsən/
Idioms
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Idioms
before you can say Jack Robinson
  1. (old-fashioned) very quickly; very soon一刹那;一眨眼工夫;突然间