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Jyutping fai3 cam2 mong4 caan1
Pinyin fèi qǐn wàng cān

Definitions (CC-CEDICT)
  1. see 廢寢忘食|废寝忘食[fei4 qin3 wang4 shi2]
Definitions (粵典–words.hk)
  1. 動詞
    形容​好​投入​一件​事​,​可以​連食​飯​同​瞓​覺​都​唔​理
    to forget to eat and sleep since one is completely absorbed in working
    • 為咗入大學,佢呢半年都廢寢忘餐噉讀書。
      为咗入大学,佢呢半年都废寝忘餐噉读书。
      wai6 zo2 jap6 daai6 hok6, keoi5 ni1 bun3 nin4 dou1 fai3 cam2 mong4 caan1 gam2 duk6 syu1.
      For the sake of entering university, he was totally absorbed with his studying in the last six months, neglecting meals and rest.
  2. 參看
    廢寢忘食
Examples (粵典–words.hk)
  1. Cantonese
    为咗入大学,佢呢半年都废寝忘餐噉读书。
    為咗入大學,佢呢半年都廢寢忘餐噉讀書。
    wai6 zo2 jap6 daai6 hok6, keoi5 ni1 bun3 nin4 dou1 fai3 cam2 mong4 caan1 gam2 duk6 syu1.
    • For the sake of entering university, he was totally absorbed with his studying in the last six months, neglecting meals and rest.
  2. Cantonese
    废寝忘餐
    廢寢忘餐
    • to forget to eat and sleep since one is completely absorbed in working