fèi qǐn wàng cān
see 廢寢忘食|废寝忘食[fei4 qin3 wang4 shi2]
废
fèi
variant of 廢|废[fei4]
寝
qǐn
old variant of 寢|寝[qin3]
忘
wàng
to forget
餐
cān
meal
