Definition of save one's breath in English:
[often in imperative] Not bother to say something because it is pointless.
- After months of writing to my elected officials I feel a whole lot better supporting this project and saving my breath.
- You're better saving your breath for the wedding speech because right now I'm not listening to any of your words!
- These worthy protesters could have saved their breath.
Definition of save one's breath in:
- US English dictionary