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Jyutping ngaau5 sat6 ngaa4 gan1
Pinyin yǎo shí yá gēn

Definitions (粵典–words.hk)
  1. 動詞
    遇到​難關​或者​困境​嘅​時​候​堅​持​落​去
    to grit one's teeth; to persevere in a hard time
  2. 參看
    咬實牙關