DON'T WASTE YOUR BREATH.

Don't waste your breath.: translation

You will not get a positive response to what you have to say, so don't even say it.; Talking will get you nowhere. •

Alice: I'll go in there and try to convince her otherwise. Fred: Don't waste your breath. I already tried it.

•

Sally: No, I won't agree! Don't waste your breath. Bill: Aw, come on. At least hear me out.