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private detective

private detective

30 3.4
A person who is not a police officer and is paid to investigate crimes
  • noun
  • /ˈpraɪvɪt dɪˈtɛktɪv/
translation icon : detective privado
  • The private detective uncovered vital evidence that led to the arrest of the criminal.

So this private detective followed him and saw us doing a job, so he reported it and so that was it.

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Examples

  • He hired a private detective to investigate the mysterious disappearance of his brother.

  • Nathan Stone, a whiskey-loving private detective, wakes up in a hospital with a concussion and memory loss.

    Blog text (3)
  • So this private detective followed him and saw us doing a job, so he reported it and so that was it.

  • You start feeling like a private detective in your own life.

  • The studio will always need its private detective.

  • Anyway, you remember that private detective that used to come in here all the time?

    Fiction book (1992)
  • We have used a firm of private detectives, with no success.

    Fiction book (1993)
  • "Yeah, she told me all about it, how it was for the private detective you hired after the police gave up."

    Fiction book (1999)
  • He hired a private detective to follow us around.

  • I inquired at the hotel for a reliable private detective.

Synonyms

detective
vsprivate detective
2.7

A police officer who investigates crimes and finds out what happened

differs by being a non police professional hired privately rather than an officer
private investigator
vsprivate detective
64 3.7

A person hired to find facts about crimes or private matters who is not a police officer

emphasizes independent work or agency hire rather than police employment
private eye
vsprivate detective
  • Informal
24 4.2

A person hired to find out information for someone, often about crimes

highlights the same role but stresses agency or solo status not police work
sleuth
vsprivate detective
14 5.6

A person who investigates crimes and follows clues

is broader, focusing on hired investigation rather than only clue following
PI
vsprivate detective
13 3.7

A person hired to find missing people or information

is the same role but often stresses independent or agency hiring over police work
gumshoe
vsprivate detective
  • Archaic
5 8.4

A detective who works quietly and follows people to find facts

is the standard occupational term rather than the informal, quiet sense
private dick
vsprivate detective
  • Archaic
4 8.8

A person hired to find facts or solve crimes for paying clients

is the neutral, standard term for that hired investigative role
shamus
vsprivate detective
  • Archaic
2 9.9

A person paid to find information about crimes or people

is the general, formal name for that hired investigative role
inquiry agent
vsprivate detective
6.5

A private detective hired to find information for people or businesses

matches this investigative function but also covers agency or solo contexts
sleuthhound
vsprivate detective
  • Archaic
9.9

A person who carefully follows clues to solve mysteries

is centered on hired investigative work rather than persistent clue hunting

How Formal

private detective
30 3.4
private eye
  • Informal
24 4.2
private dick
  • Archaic
4 8.8

Surface Forms

Morphology

private + detective

The meaning 'a detective not employed by the police' is directly and predictably built from 'private' (not public/for specific individuals) modifying 'detective' (a person who investigates crimes). This simple adjective+noun composition is cross-linguistically common and follows standard English patterns, so a B1 learner who knows both words should understand the MWE.

Etymology

The noun private detective comes from the idea of someone who is private, meaning they work for one person and not the police, and a detective, meaning someone who finds clues. They often work quietly, follow people, and find hidden facts, so today private detective means 'a person hired to investigate or find information, not a police officer'.