snatch block

from WordNet (r) 3.0 (2006)
snatch block
    n 1: a pulley-block that can be opened to receive the bight of a
         rope
from The Collaborative International Dictionary of English v.0.48
Snatch block \Snatch block\ (Naut.),
   a kind of block with an opening in one side to receive the
   bight of a rope.
   [1913 Webster]
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