private detective
noun/ˌpraɪvət dɪˈtektɪv/
/ˌpraɪvət dɪˈtektɪv/
(also private investigator)
(also informal private eye)
- a detective who is not in the police, but who can be employed to find out information, find a missing person, follow somebody, etc.
- She hired a private detective to follow her husband.
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private detective