Definition
To make a maximum effort; to try one's hardest to achieve something without holding back.
竭盡全力
He never spared himself in order to complete the project.
他為了完成這個項目，從不吝惜自己的努力。
She never spared herself while preparing for the marathon.
她在準備馬拉松時，從不吝惜自己的努力。
They did not spare themselves in their all-out effort to achieve their goal.
他們在全力以赴實現目標時，從不吝惜自己的努力。