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to save one's breath
01
時間とエネルギーを無意味に浪費する
to avoid wasting one's time and energy by not trying to persuade or convince someone who is unlikely to change their opinion or behavior
![to [save] {one's} breath definition and meaning](https://cdn.langeek.co/photo/40965/original/?type=jpeg "to [save] {one's} breath definition and meaning")
例
I knew that, so I saved my breath, and offered no explanations.
Save your breath, Tom.
