敂〔叩〕 {kòu}

1. to knock
2. to kowtow

叩問〔-问〕 kau³ man⁶ {kòu wèn}

to ask humbly; to make inquiries

叩謝〔-谢〕 kau³ ze⁶ {kòu xiè}

to express one's sincere gratitude by kowtow

叩拜 kau³ baai³ {kòu bài}

1. to bow in salute
2. to kowtow

叩見〔-见〕 kau³ gin³ {kòu jiàn}

to kowtow in salute

叩關〔-关〕 kau³ gwaan¹ {kòu guān}

1. to knock at the gate (old)
2. to make an approach
3. to invade
4. to attack the goal (sports)

叩應〔-应〕 kau³ jing³ {kòu yìng}

call-in (loanword)

叩謁〔-谒〕 kau³ jit³ {kòu yè}

to visit (esp. one's superiors)

叩球 kau³ kau⁴ {kòu qiú}

spike (volleyball)

叩門〔-门〕 kau³ mun⁴ {kòu mén}

to knock on a door

叩首 kau³ sau² {kòu shǒu}

1. to kowtow
2. also written 磕頭

叩頭〔-头〕 kau³ tau⁴ {kòu tóu}

1. to kowtow (traditional greeting, esp. to a superior, involving kneeling and pressing one's forehead to the ground)
2. also written 磕頭