廢寢忘餐

fei4 qin3 wang4 can1

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

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廢寢忘餐|废寝忘餐 [fèi qǐn wàng cān] ► to neglect sleep and food (idiom); to skip one's sleep and meals ► to be completely wrapped up in one's work