talk the talk，but not walk the walk 说一套，做一套
When it comes to recycling he talks the talk but he doesn't walk the walk.
Chelsea always talks big, but she never take actions—she definitely talks the talk but doesn't walk the walk.
Anybody can run their mouth like that, but can you talk the talk and walk the walk?
The boss can't keep his promise to employees. He talks the talk but doesn't walk the walk.
Stop talking about it. You always talk the talk but don't walk the walk.