Definition of John Hancock noun from the Oxford Advanced Learner's Dictionary

 

John Hancock

 noun
noun
BrE BrE//ˌdʒɒn ˈhæŋkɒk//
 
; NAmE NAmE//ˌdʒɑːn ˈhæŋkɑːk//
 
(North American English, informal)
 
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a person’s signature Just put your John Hancock here. 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.
See the Oxford Advanced American Dictionary entry: John Hancock