Definition of gumshoe noun from the Oxford Advanced Learner's Dictionary

 

gumshoe

 noun
noun
BrE BrE//ˈɡʌmʃuː//
 
; NAmE NAmE//ˈɡʌmʃuː//
 
(old-fashioned, North American English, informal)
 
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= detective (1) Word Origin early 20th cent.: from gumshoes in the sense ‘sneakers’, suggesting stealth.
See the Oxford Advanced American Dictionary entry: gumshoe