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Phrase(s): The customer is always right.
Prov. In order to keep customers happy, the people who serve them should always obey their wishes. (Often cited as a principle of good business dealings; customers sometimes say it to the people serving them in order to try to get good service.) • When I began working at the gift shop, my boss told me, "Remember, the customer is always right, no matter how stupid or rude you may think he is being."
McGrawhill's American Idioms And Phrasal Verbs