Webster's English Dictionary

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breaker

1. break.er \'bra--k*r\ n 1a: one that breaks  1b: a device or instrument 
   that breaks; specif : a machine or plant  for breaking rocks or crushing 
   anthracite 2: a wave breaking into foam against the shore, a sandbank, or a 
   rock  3: a strip of fabric under the tread of a tire for extra protection 
   of the  carcass
2. brea.ker \'bra--k*r\ n [by folk etymology fr. Sp barrica] : a small 
   water cask