叩

三跪九叩

sān guì jiǔ kòu

to kneel three times and kowtow nine times (formal etiquette on meeting the emperor)

叩问

kòu wèn

(literary) to inquire

叩应

kòu yìng

call-in (loanword)

叩拜

kòu bài

to bow in salute; to kowtow

叩球

kòu qiú

spike (volleyball)

叩见

kòu jiàn

to kowtow in salute

叩谒

kòu yè

to visit (esp. one's superiors)

叩门

kòu mén

to knock on a door

叩关

kòu guān

to knock at the gate (old)

叩头

kòu tóu

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

叩首

kòu shǒu

to kowtow

跪叩

guì kòu

to kowtow