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English definition of “Jack Robinson”

Jack Robinson

noun uk   /ˌdʒækˈrɒb.ɪn.sən/ us    /-ˈrɑː.bɪn-/ old-fashioned
before you can/could say Jack Robinson done or happening very quickly: I put the plate of food on the floor, and before you could say Jack Robinson, the dog had eaten it.
(Definition of Jack Robinson from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of Jack Robinson?
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