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Related to snatch block: sheave block
A block that can be opened on one side to receive the looped part of a rope.
(Nautical Terms) nautical a block that can be opened so that a rope can be inserted from the side, without threading it through from the end
[C17: so called because the rope can be inserted quickly: figuratively, the block snatches it. See snatch]
a block that can be opened to receive the bight of a rope at any point along its length.