# private eye

idiom

Source: https://englishreference.com/idiom/private-eye
Updated: 2026-08-10

## Meaning

A private personal detective, employed to gather information about someone.

## Examples

- The family hired a private eye to find their lost dog.
- A private eye watches the house from a parked car.
- You need a private eye to help solve this mystery.
- She suspected her business partner was stealing money, so she hired a private eye to follow him.
- The insurance company sent a private eye to check if the man was actually injured or just pretending.
- He decided to become a private eye after working as a police officer for twenty years.
- A private eye took photos of the secret meeting to prove the lawyer was talking to the rival company.
- The weary private eye spent weeks trailing the suspect through the city, hoping to uncover the truth behind the mysterious disappearance.

## Origin

Derived from the abbreviation P.I. for private investigator, the term relies upon the homophony between the letter I and the word eye. It further references the eye as a symbol of surveillance. The transition from the initialism to the noun occurred as the visual metaphor for observation aligned with the phonetic requirements of the abbreviation.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.