只为她袖手天下
[zhĭ wéi tā xiù shŏu tiān xià]
'Willing to let go of the whole world for her' conveys a willingness to renounce everything—including power or achievements—to devote oneself to another person's needs exclusively. Here, “her” usually refers to a woman deeply adored, and indicates that all the grandness of life would turn worthless if she were not part of it; thus choosing her over every tangible thing showcases an almost poetic level of commitment