kowtow
To kneel and bow low enough to touch one’s forehead to the ground.
historical, intransitive
When the weather turned cold, the tears that he shed would become frozen like veins; the blood on his forehead from kowtowing would also freeze and would not drip.
To grovel, act in a very submissive manner; to show obeisance to (someone or something) in such a manner; to bow.
figuratively, intransitive
I suppose you're going to be nice to Odie and kowtow to Jon and lick the mailman's boots! I don't like you already.
To bow very deeply.
intransitive
Where it comes from
From either Cantonese 叩頭 /叩头 (kau³ tau⁴) or Mandarin 叩頭 /叩头 (kòutóu). Literally, “knock head”.
Adapted from the Wiktionary entry kowtow (CC BY-SA 4.0).