没齿难忘 mò chǐ nán wàng

DEFINITIONS

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

CHARACTERS

没 mò
HSK 1
not, have not, none; drown, sink
齿 chǐ
HSK 5
teeth; gears, cogs; age; simplified form of the KangXi radical number 211
难 nán
HSK 3
difficult, arduous, hard; unable
忘 wàng
HSK 3
forget; neglect; miss, omit