What does "loaf" mean?

Loaf: Any thick lump, mass, or cake; especially, a large regularly shaped or molded mass, as of bread, sugar, or cake. Bacon. Loaf sugar, refined sugar that has been formed into a conical loaf in a mold.

Additional senses

  1. 2.To spend time in idleness; to lounge or loiter about. " Loafing vagabonds." W. Black.
  2. 3.To spend in idleness; -- with away; as, to loaf time away.

Sources