A person in charge of a worker or organization. She reported her concerns to her boss during the meeting.
A protuberance or raised area, often used in mechanical contexts. The engineer noted the boss on the surface of the metal part.
An influential figure who controls a political organization, criminal enterprise, or other group, often operating behind the scenes. The city was effectively run by a party boss who decided which projects received funding.
In video gaming, a powerful opponent, especially one encountered at the end of a level or game. After hours of play, they finally defeated the final boss and saw the credits roll.