kowtow (n.) Look up kowtow at Dictionary.com
also kow-tow, 1804, from Chinese k'o-t'ou custom of touching the ground with the forehead to show respect or submission, literally "knock the head," from k'o "knock, bump" + t'ou "head." The verb in the figurative sense of "act in an obsequious manner" is from 1826. Related: Kowtowed; kowtowing.