废寝忘餐

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