What does "breaker" mean?

Breaker: Specifically: A machine for breaking rocks, or for breaking coal at the mines; also, the building in which such a machine is placed.

Additional senses

  1. 2.(Naut.) A small water cask. Totten.
  2. 3.A wave breaking into foam against the shore, or against a sand bank, or a rock or reef near the surface. The breakers were right beneath her bows. Longfellow.

Sources