I am not going to waste my breath on you.
But nor should you waste your breath trying to get more out of him.
Don't waste your breath until you've got a good way away from the station.
Maybe that's why he didn't waste his breath trying to talk to them.
Now, for example, he did not waste breath on questions.
I thought of asking how and why, but didn't waste my breath.
I didn't know what, or why he'd waste breath on speech at such a time.
I didn't waste my breath trying to argue with them.
"Then why didn't you tell him not to waste his breath?"
"I'd be wasting my breath trying to talk you out of this?"
Idiome