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private investigator

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noun
  1. private detective. Abbreviation: PI, p.i., P.I.
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Origin of private investigator

First recorded in 1935–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for private investigator

sleuth, gumshoe, reporter, agent, spy, informer, prosecutor, cop, eavesdropper, tail, investigator, sleuthhound, flatfoot, dick, tracker, bloodhound, fink, eye, snoop, scout