卧薪嘗膽 [－－尝胆]

Jyutping ngo6 san1 soeng4 daam2
Pinyin wò xīn cháng dǎn

Definitions (粵典–words.hk)
  1. 名詞
    喺​惡​劣​嘅​環​境​下​暗中​計劃​報​復
    to lay low and plot revenge or comeback
  2. 參看
    卧薪嚐膽