ㄎㄡˋㄊㄡˊkòutóu

叩头
  1. 磕頭叩首」。 叩頭賠罪」、叩頭道謝」、拼命叩頭求饒」。

to kowtow (traditional greeting, esp. to a superior, involving kneeling and pressing one's forehead to the ground)​, also written 磕頭[ke1 tou2]
kowtow
Kotau (S, Gesch)​