Definition of mystery shopping noun from the Oxford Advanced Learner's Dictionary

 

mystery shopping

 noun
noun
BrE
 
; NAmE
 
[uncountable]
 
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the activity of visiting or telephoning a shop/store or other business pretending to be a customer, in order to get information on the quality of the service, the facilities, etc. Today, mystery shopping is primarily used by businesses to measure their customer service.