created sense approved 没齿难忘/沒齒難忘 · mòchǐnánwàng · undying gratitude
没齿难忘 / 沒齒難忘
mòchǐnánwàng
undying gratitude
To remember a favor or a benefactor's kindness for as long as one lives; literally, hard to forget even after one's teeth fall out in old age.
您的大恩大德，我必将没齿难忘。