摩頂放踵（摩頂放踵）　

◎ 摩頂放踵 módǐng-fàngzhǒng

[dedicate oneself completely to the welfare of mankind;wear oneself out from head to foot to help others] 摩禿了頭頂,走破了腳跟。形容不辭辛勞,舍己為人