To use force or power to control others; to hold hostage, threaten, or intimidate someone into doing something.

the ruler of the empire, literally "son of heaven"; in ancient times, the emperor was believed to have been granted the right to rule by heaven

in order to; so as to; used to connect two phrases where the second is the purpose of the first

to order; to command; a decree; a warrant or writ

(historical) Dukes, princes, or local rulers who governed parts of the country under the emperor during the Zhou and early Han dynasties.