跪 ⇒

• 足         jù/zú, excessive, foot/to be sufficient/ample
  • 口         kǒu, mouth/classifier for things with mouths (people, domestic animals, cannons, well...
  • 止         zhǐ, to stop/to prohibit/until/only
• 危         Wēi/wēi, surname Wei, danger/to endanger/Taiwan pr. [wéi]
  • 卩         jié, "seal" radical in Chinese characters (Kangxi radical 26)
  • 厃         
    • 厂         hǎn/chǎng, [廠], "cliff" radical in Chinese characters (Kangxi radical 27), occurring in 原, 历, 压 ...
    •          

叩 ⇒

• 口         kǒu, mouth/classifier for things with mouths (people, domestic animals, cannons, well...
• 卩         jié, "seal" radical in Chinese characters (Kangxi radical 26)

跪 ⇒

叩 ⇒

• 命        mìng, life/fate/order or command/to assign a name, title etc
  • 掵        

跪 ⇒
跪下         guìxia, to kneel down
跪         guì, to kneel
下跪         xiàguì, to kneel/to go down on one's knees
跪倒         guìdǎo, to kneel down/to sink to one's knees/to grovel
跪拜         guìbài, to kowtow/to kneel and worship
跪坐         

叩 ⇒
叩         kòu, [敂], to knock/to kowtow, old variant of 叩[kòu]/to knock
叩击         
叩首         kòushǒu, to kowtow/also written 磕頭|磕头[kē tóu]
叩头         kòutóu, [叩頭], to kowtow (traditional greeting, esp. to a superior, involving kneeling and pres...
叩门         kòumén, [叩門], to knock on a door