Usage patterns
〈人〉のボスになるto become the boss of a group of people
He became the boss of the team.
ボスを倒すto defeat the boss (in a video game)
In this game, defeating the final boss is difficult.
ボスに気に入られるto be liked/favored by one's boss
She is well-liked by her boss.
ボスに逆らうto defy or go against one's boss
It's rare for a new employee to defy the boss.