talk the talk

Từ điển Oxford Advanced Learner 8th

ˌtalk the ˈtalk idiom
(informal, sometimes disapproving)to be able to talk in a confident way that makes people think you are good at what you do
•You can talk the talk, but can you walk the walk? (= can you act in a way that matches your words?)
Main entry: ↑talk_idiom