Kowtow n. & v. i. : The same as Kotow.

Example:
Why does Congress Kowtow to Philip Morris to get anything done?

Taxonomy
kowtow, gestures, the Emperor, ground, reverence, ancestor, free encyclopedia, Transliterations, bow, Imperial court, ceremonies, three times, commoner, Korean, kòutóu, kau, Traditional usage, the Chinese.

Defination from the web:
kowtow is the highest sign of reverence. ... Depending on the solemnity of the situation, different grades of kowtow would be used. ... More usually, however, a single kowtow is sufficient. ...