gumshoe
noun/ˈɡʌmʃuː/
/ˈɡʌmʃuː/
(North American English, old-fashioned, informal)- a detectiveWord Originearly 20th cent.: from gumshoes in the sense ‘sneakers’, suggesting stealth.
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gumshoe
Definition of gumshoe noun from the Oxford Advanced Learner's Dictionary