废寝忘食

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

to abolish / to abandon / to abrogate / to discard / to depose / to oust / crippled / abandoned / waste

variant of 廢|废[fei4] / disabled

old variant of 寢|寝[qin3]

to lie down

to forget / to overlook / to neglect

to eat / food / animal feed / eclipse

to feed (a person or animal)