boss

a person who employs or superintends workers; manager.

a politician who controls the party organization, as in a particular district.

a person who makes decisions, exercises authority, dominates, etc..

(in a video game or role-playing game) a powerful nonplayer character, often appearing at the end of a level or at the end of the game, who must be defeated in order for a player to move on to a new level or to win the game (often used attributively): Your objective for this boss-level event is to survive several waves of zombie attacks.

to be master of or over; manage; direct; control.

to order about, especially in an arrogant manner.

to be boss.

to be too domineering and authoritative.

chief; master.

Slang.,  first-rate.

Botany, Zoology.,  a protuberance or roundish excrescence on the body or on some organ of an animal or plant.

Geology.,  a knoblike mass of rock, especially an outcrop of igneous or metamorphic rock.

an ornamental protuberance of metal, ivory, etc.; stud.

Architecture.

1. an ornamental, knoblike projection, as a carved keystone at the intersection of ogives.

2. a stone roughly formed and set in place for later carving.

Bookbinding.,  one of several pieces of brass or other metal inset into the cover of a book to protect the corners or edges or for decoration.

Machinery.,  a small projection on a casting or forging.

Nautical.,  a projecting part in a ship's hull, or in one frame of a hull, fitting around a propeller shaft.

to ornament with bosses.

to emboss.

(in plumbing) to hammer (sheet metal, as lead) to conform to an irregular surface.