lock stock and barrel

The phrase "lock, stock, and barrel" is an idiom that means completely, entirely, or everything. It refers to the three main components of a musket or gun: the lock (the firing mechanism), the stock (the wooden handle or body), and the barrel (the metal tube through which the projectile is fired). When someone says "lock, stock, and barrel," they are indicating that something is being done or taken in its entirety, leaving nothing behind.