peeper
In real, traceable use. Part of the curated seed collection; community review is coming.
Meaning · English
A private detective.
Register: dated, derogatory, slang
Where it’s used:
Used
American English
Examples
So you go to see this peeper, this Marlowe. That was your mistake.
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “peeper” mean?
A private detective.
Is “peeper” formal or informal?
peeper is generally dated, derogatory, slang.