gumshoe

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++gum·shoe /ˈɡʌmʃuː/ noun [countable] American English old-fashioned  INVESTIGATEa detective 侦探

Examples from the Corpus

gumshoe• Dennis Miller is a down-at-the-heels gumshoe.• But he makes the pulp gumshoe formula look like a comforting ritual only normal societies can perform.• With Petersen under lock and key, life for the gumshoes of the Office of Security returned to normal.Origin gumshoe (1900-2000) gumshoe “rubber shoe” ((19-20 centuries)); because detectives walk quietly

gum·shoe nounChineseSyllable  

Corpus a detective

gumshoe
gum‧shoe /ˈɡʌmʃuː/ noun [countable] American English old-fashioneda detective

gum·shoeBrE /ˈɡʌmʃuː/ 🔊NAmE /ˈɡʌmʃuː/ 🔊 noun (old-fashioned, NAmE, informal) = detective (1)