勿忘國恥 [－－国耻]

Jyutping mat6 mong4 gwok3 ci2
Pinyin wù wàng guó chǐ

Definitions (CC-CEDICT)
  1. Never forget national humiliation, refers to Mukden railway incident of 18th September 1931 九一八事變|九一八事变 and subsequent Japanese annexation of Manchuria