To be good at; to be expert in.

without authorization or permission

to leave one's post or duty without permission; to be absent without leave

to arrogate power

to act on one's own initiative or authority without seeking proper permission

arbitrary; to make decisions on one's own authority

to enjoy fame or excellence exclusively without sharing; to take all the credit for oneself

to excel in a particular field or be the leading, most prominent figure in an arena or performance

to enjoy exclusive imperial or marital favor as a concubine

to enter a place without permission or authorization