Longman Dictionary of Contemporary English
WordNet
n. a private detective employed by a merchant to stop pilferage
Wikipedia
A store detective (sometimes called a SD) is a member of Loss Prevention whose main role is to prevent and detect theft (commonly known as shoplifting) and reduce shrink in retail outlets. They do this by patrolling the store in plains clothes looking to identify members of the public who are stealing from the store. More common terms today with major retailers are Loss Prevention Agent, Detective or Investigator and Asset Protection Officer. Special Officer, once common, is now rarely used, as few jurisdictions still allow it.
Usage examples of "store detective".
When he returned with the policeman the store detective was waiting in the vestibule.
He didn't catch on until he realized that the store detective was shadowing them.
From the counter in front of me, a nurse gave me the once-over a store detective aims at a potential shoplifter.
Somewhere a little girl screamed like a hurt animal and he thought Don't cry, darling, it's just dumb old George falling down, I do it frequently around the house these days and someone else jolly old Santa, maybewas cursing and yelling for the store detective.
But she did not notice that the handle was sticking out of the side and the store detective stopped her.
Miss Teatime, in her own, slightly old-world way, was a nice mover too, even if she entertained private doubts of her capacity these days to outdistance a determined store detective.
Somewhere a little girl screamed like a hurt animal and he thought Don't cry, darling, it's just dumb old George falling down, I do it frequently around the house these days and someone else jolly old Santa, maybe-was cursing and yelling for the store detective.
But she had pressed a button in the wall beside her, and at this moment a store detective appeared, wearing the insensitive expression of his kind.
Julian and I met in the rest room a few more times before we were interrupted by a store detective who, I am convinced, was interested in arranging a three-way.