an employee of a department store, hotel, etc., employed to prevent thefts, violations of regulations, or other forms of misconduct on the part of patrons.
on the house
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From POTUS To FLOTUS: A Full (White) House Of Acronyms
Origin of house detective
An Americanism dating back to 1895–1900
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019