talk the talk (but not walk the walk)
/ˌtɔːk ðə ˈtɔːk bət nɒt ˌwɔːk ðə ˈwɔːk/idiom
to say impressive things but fail to act on them; to speak confidently without doing what you promise
красиво говорить, но не делать; слова расходятся с делом
Русский аналог: «слова расходятся с делом; много говорит, мало делает»
Частая форма: They talk the talk, but don’t walk the walk. Положительная: walk the walk — делать то, о чём говоришь. Американский вариант: walk the talk.
“Politicians talk the talk, but do they walk the walk?”
“He talks the talk, but he doesn’t walk the walk.”
“She talks the talk about green energy, but she drives a huge car.”