Definition of Jack Robinson noun from the Oxford Advanced Learner's Dictionary

 

Jack Robinson

 noun
noun
BrE BrE//ˌdʒæk ˈrɒbɪnsn//
 
; NAmE NAmE//ˌdʒæk ˈrɑːbɪnsn//
 
 
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Idioms
before you can say Jack Robinson
 
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(old-fashioned) very quickly; very soon More Like This Expressions with people’s names Aunt Sally, Hobson’s choice, Hooray Henry, Houdini, Jack the Lad, Jack Robinson, Jane Doe, Joe Bloggs, Joe Public, Joe Sixpack, John Bull, John Doe, John Hancock, Johnny Reb, PC Plod, Uncle SamSee worksheet.