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Synonyms

private detective

American  

noun

  1. a detective who is not a member of an official force but is employed by private parties.

private detective British  

noun

  1. Also called: private investigator.  an individual privately employed to investigate a crime, keep watch on a suspected person, or make other inquiries

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of private detective

First recorded in 1865–70

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Enter Dell Chandler, a failed English professor turned bootstrapping private detective, hired by Dr. Cutty to investigate.

From Los Angeles Times • May 12, 2026

Claude, meanwhile, having left the police to become a private detective, is obsessed with solving a string of related wartime murders, including that of Huguette’s father.

From The Wall Street Journal • Jan. 16, 2026

Marten's family also hired a private detective to find her.

From BBC • Jul. 14, 2025

I can also tell you that his character, John Sugar, is not an ordinary private detective, in ways that go beyond his fetishization of the film noir heroes he emulates.

From New York Times • Apr. 5, 2024

During much of the nineteenth and early twentieth centuries, private detective agencies had filled the vacuum left by decentralized, underfunded, incompetent, and corrupt sheriff and police departments.

From "Killers of the Flower Moon" by David Grann

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.