juice bar n. a methadone clinic, especially one that is seen to encourage addiction rather than cure it. (source: Double-Tongued Dictionary)
Further reading
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Not sure where you got this definition of ‘juice bar’, but it seems rather narrow given the fact that juice and smoothie retail stores are called juice bars and have been since the 1950s.
What do you mean “you’re not sure”? Can’t you see the four citations that show how it’s being used?