ㄇㄛˊㄉㄧㄥˇㄈㄤˇㄓㄨㄥˇmódǐng‑fǎngzhǒng

摩顶放踵
módǐng‑fàngzhǒngㄇㄛˊ ㄉㄧㄥˇ ㄈㄤˋ ㄓㄨㄥˇ
  1. 從頭腳跟比喻不辭勞苦」。 摩頂放踵災區重建奔走」、為了教育事業摩頂放踵在所不辭」。

to rub one's head and heels (idiom)​; to slave for the benefit of others, to wear oneself out for the general good