Remember, the 'customer' is always right. [=never argue with a customer]
He is one tough/tricky 'customer'. [=he is a tough/tricky person]
The company has good/poor 'customer' service.
(..) not enough for this place. They speak Arabic, Urdu, Dari, Pashto, Mongolian, Farsi, Russian. - Who are these people? - They are your loyal customers, sir. They call themselves the Ten Rings. You know, we might be more productive if you include me in the planning process. Okay, we don't need this. (..)2008 Iron Man