叩

to knock / to kowtow

old variant of 叩[kou4] / to knock

"seal" radical in Chinese characters (Kangxi radical 26)

mouth / classifier for things with mouths (people, domestic animals, cannons, wells etc) / classifier for bites or mouthfuls

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

to knock on a door

call-in (loanword)

to bow in salute / to kowtow

spike (volleyball)

to kowtow in salute

to visit (esp. one's superiors)

to knock at the gate (old) / to make an approach / to invade / to attack the goal (sports)

to bow in salute; to kowtow

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

(literary) to inquire / to ask / question