To feel and show deep gratitude to a benefactor and vow to repay their kindness even after death; literally "to tie grass and carry a ring in the mouth" based on two historical legends of supernatural repayment.

(idiom) to express undying gratitude to a benefactor; to vow to repay a kindness in this life or the next. Same as [[结草衔环|結草銜環|jie2 cao3 xian2 huan2]].