noun
a slang term for a detective or investigator
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The gumshoe detective carefully examined the crime scene for any clues.
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I heard that gumshoe is on the case to find out who stole the cookies from the break room.
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The gumshoe managed to crack the case and bring the culprit to justice.
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She had a reputation for being a gumshoe when it came to uncovering gossip in the office.