◎ 啃骨頭 kěn gǔtou
(1) [gnaw a bone;pick a bone]∶用牙剝食骨頭上的肉
那只狗在啃骨頭
(2) [a job that was difficult and not very profitable]∶比喻難做的而又沒有什么油水的工作,常和“吃肉”對舉
吃肉和啃骨頭的事都得干

1.gnaw a bone; pick out the residual meat on the bones with teeth