Daily Chinese Idiom Guessing Game
To do something with complete dedication and effort, putting in one's best.
指费尽心力。
《晋书·王坦之传》且受遇先帝，绸缪缱绻，并志竭忠贞，尽心尽力，归诚陛下，以报先帝。”
She approached every task with jìn xīn jìn lì, ensuring no detail was overlooked.