吃裡爬外

to work against the interests of sb one derives support from / to double-cross one's employer / to bite the hand that feeds you

to eat / to consume / to eat at (a cafeteria etc) / to eradicate / to destroy / to absorb / to suffer / to stammer (Taiwan pr. for this sense is [ji2])

variant of 吃[chi1]

lining / interior / inside / internal / also written 裏|里[li3]

to crawl / to climb / to get up or sit up

outside / in addition / foreign / external