Jack Robinson Definition in British English Dictionary
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Definition of "Jack Robinson" - British English Dictionary

Jack Robinsonnoun

uk   /ˌdʒækˈrɒb.ɪn.sən/  us   /-ˈrɑː.bɪn-/ old-fashioned
before you can/could say Jack Robinson used to refer to something being done or happening very quickly: I put the dish 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)
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