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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.Fast and rapidShort in time
(Definition of Jack Robinson from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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