北面

Etymology
According to ancient convention, the most important person in a room would be seated on the north side facing south. All subordinates would therefore be facing north, in deference to the most important person (such as the emperor).

Noun

 * 1) north; north side
 * 2)  official in feudal court

Verb

 * 1)  to face north (in deference to the emperor or one's superior)
 * 2)  to follow a master