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Synonyms

private eye

American  

noun

Slang.
  1. a private detective.


private eye British  

noun

  1. informal a private detective

"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

private eye Idioms  
  1. A privately employed detective, as opposed to one working for the police or another authority. For example, The children loved stories about private eyes, and Janey wanted to become one. This expression comes from the term private investigator, the “i” of investigator being changed to “eye,” which plays on the idea of a person looking into things. [1930s]


Etymology

Origin of private eye

1935–40; eye, allusive phonetic rendering of I, abbreviation of investigator

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.

See Examples For:

The author of “Gravity’s Rainbow” sends a private eye on the trail of a missing heiress in a complex, comic, Prohibition-era caper.

From The Wall Street Journal Oct. 3, 2025

The article focused on Robert Winnett, the British journalist poised to take over The Post’s newsroom in November, and described his links to a private eye who used unethical media practices to land big exclusives.

From New York Times Jun. 17, 2024

Apple TV+ has “Sugar,” starring Colin Farrell as a cinephile private eye in contemporary L.A. hired to locate a missing woman.

From Los Angeles Times May 28, 2024

“The New York Trilogy,” which included “City of Glass,” “Ghosts” and “The Locked Room,” was a postmodern detective saga in which names and identities blur and one protagonist is a private eye named Paul Auster.

From Seattle Times May 1, 2024

An undercover private eye was placed in Savage’s boardinghouse.

From "Killers of the Flower Moon" by David Grann

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