Definition
To make a maximum effort; to try one's hardest to achieve something without holding back.
竭尽全力
He never spared himself in order to complete the project.
他为了完成这个项目，从不吝惜自己的努力。
She never spared herself while preparing for the marathon.
她在准备马拉松时，从不吝惜自己的努力。
They did not spare themselves in their all-out effort to achieve their goal.
他们在全力以赴实现目标时，从不吝惜自己的努力。