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Phrase(s): Talk is cheap.
Prov. It is easier to say you will do something than to actually do it. (Saying this in response to someone who promises you something implies that you do not believe that person will keep the promise.) • My boss keeps saying she’ll give me a raise, but talk is cheap. • You’ve been promising me a new dishwasher for five years now. Talk is cheap.
McGrawhill's American Idioms And Phrasal Verbs