Meaning of “lip service” in the English Dictionary

american-english dictionary

(Definition of “lip service” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"lip service" in American English

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lip servicenoun [ U ]

us /ˈlɪp ˌsɜr·vɪs/

to publicly support or approve of something, while actually taking no action to produce it:

A lot of adults pay lip service to the idea that it is important to listen to teenagers' ideas, but they tend to listen and then forget.
Is this a real promise, or is this just lip service?

(Definition of “lip service” from the Cambridge Academic Content Dictionary © Cambridge University Press)