ㄇㄛˋˇchǐㄋㄢˊnánㄨㄤˋwàng

  1. 沒齒一輩子沒齒難忘永遠忘記·李商隱〉:司馬談沒齒難忘。」沒齒不忘」、沒齒難泯」、沒世不忘」、沒世難忘」、沒身不忘」。

hard to forget even after one's teeth fall out (idiom)​; to remember a benefactor as long as one lives, undying gratitude