废 ㄈㄟ ˋ fèi 寝 ㄑㄧㄣ ˇ qǐn 忘 ㄨㄤ ˋ wàng 食 ㄕ ˊ shí 廢 ㄈㄟ ˋ fèi 寢 ㄑㄧㄣ ˇ qǐn 忘 ㄨㄤ ˋ wàng 食 ㄕ ˊ shí to neglect sleep and forget about food (idiom) to skip one's sleep and meals to be completely wrapped up in one's work