废寝忘餐
      Explanation: Forget to sleep, refused to eat. Concentrate on something or describe selfless work, study.
      Source: Southern King of Qi Rong, "Qushui poem" Preface: "I still possessed out everything else, Jackson sundial forgotten meal."
      Examples: Undisputed claims provoke hate fight situation cited, chou ~ disease. ★ Yuan Wang Shih-fu, "The West Chamber" second break of the fifth