MEANING:
a private detective; a private investigator.

EXAMPLE SENTENCES:

She hired a private detective to find out if her husband was having an affair.

Jack’s a hard-boiled private eye who narrates the entire film in voice-over, and who finds himself investigating an ancient Egyptian cult that worships chainsaws.

I thought I was watching some television detective show where the private eye puts together the clues and reveals the killer, who then admits all and is ready to be taken away.

And Donald was a great character, a detective in the classic sense of an old-school private eye detective.

And the next private eye he hires might not do things my way.

Anyway, good for you, Tarra, honey, playing the private eye for the family.

We never have any trouble with them, which is a lot more than I can say for some of these private eye agencies