废寝忘食 (fèi qǐn wàng shí)

Character breakdown

• 废 (fèi) · 8 strokes

  Phonosemantic compound. 广 represents the meaning and 发 represents the sound. Simplified form of 廢.

• 寝 (qǐn) · 13 strokes

  Phonosemantic compound. 𪧇 represents the meaning and 𠬶 represents the sound.

• 忘 (wàng) · 7 strokes

  Phonosemantic compound. 心 represents the meaning and 亡 represents the sound.

• 食 (shí) · 9 strokes

  Depicts a mouth (亼) eating from a food vessel (皀).

Usage

他废寝忘食地研究这个课题。

to neglect sleep and forget about food (idiom); to skip one's sleep and meals; to be completely wrapped up in one's work

tā fèi qǐn wàng shí dì yán jiū zhè ge kè tí 。