口头禅;空头支票;
例句:
John paid lip service to Helen's new hairstyle.
约翰无诚意地赞美海伦之新发型.
What he promised us is but a lip-service.
他对我们的许诺不过是个空头支票而已.
Don't give me lip service. I want to see some action!
别跟我说好听的, 我要见你得行动.