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waste (one's) breath
To talk of, discuss, or say things that are likely to be ignored or are in vain. Don't bother trying to change my mind about this, you're wasting your breath! It looks like I wasted my breath trying to pitch my idea to the board of directors.
waste no time (in) (doing something)
To act or do something immediately or as expediently as possible. Wow, Sarah wasted no time finding a new boyfriend after she and Rob split up. We have to have the application in by tomorrow morning, so we must waste no time in getting everyone's signature that we need.
waste on (someone or something)
To expend something on a person or thing that will not appreciate or properly utilize it. A noun or pronoun can be used between "waste" and "on." Her talent in art is wasted on me—I have no eye for design.
You're (just) wasting my time.
Inf. What you have to say is of no interest to me. Rachel: I've heard enough. You're just wasting my time. Good-bye. Mary: If that's the way you feel about it, good-bye. Bill: Come on, Bill. I'll show you what I mean. Bill: No, you're wasting my time.
be wasting your breath
If someone is wasting their breath, there is no point in them continuing with what they are saying, because it will not have any effect. He wanted to protest again, but the tone of her voice told him he was wasting his breath. Before I could get very far he interrupted me to tell me that I was wasting my breath. Note: You can say that something being said is a waste of breath. He would admit to the thefts, but deny everything else, and her accusations would be a waste of breath.