沒齒難忘

mo4 chi3 nan2 wang4

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

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沒齒難忘|没齿难忘 [mò chǐ nán wàng] ► hard to forget even after one's teeth fall out (idiom); to remember a benefactor as long as one lives ► undying gratitude