save your breath
不要浪費時間和精力去說服別人或試圖影響他們的決定，因為他們不會改變主意。
口語·勸人放棄
英文釋義
to not waste your time and effort trying to convince or persuade someone, as they are unlikely to change their mind
例句
Save your breath—he won't listen anyway.
典故來源
源自17世紀，呼吸代表說話能量，節省呼吸即停止無效勸說。