Definition of save one's breath in English:

save one's breath

[often in imperative] Not bother to say something because it is pointless.
More example sentences
  • 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.
See parent entry: save

Definition of save one's breath in:

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