From The Collaborative International Dictionary of English v.0.48 [gcide]:
Breaker \Break"er\, n.
1. One who, or that which, breaks.
[1913 Webster]
I'll be no breaker of the law. --Shak.
[1913 Webster]
2. Specifically: A machine for breaking rocks, or for
breaking coal at the mines; also, the building in which
such a machine is placed.
[1913 Webster]
3. (Naut.) A small water cask. --Totten.
[1913 Webster]
4. A wave breaking into foam against the shore, or against a
sand bank, or a rock or reef near the surface.
[1913 Webster]
The breakers were right beneath her bows.
--Longfellow.
[1913 Webster]
5. a quarry worker who splits off blocks of stone.
Syn: ledgeman.
[WordNet 1.5]
From WordNet (r) 3.0 (2006) [wn]:
breaker
n 1: a quarry worker who splits off blocks of stone [syn:
breaker, ledgeman]
2: waves breaking on the shore [syn: surf, breaker,
breakers]
3: a device that trips like a switch and opens the circuit when
overloaded [syn: circuit breaker, breaker]