Stop plank

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one of a set of planks employed to form a sort of dam in some hydraulic works.

See also: Stop

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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References in periodicals archive ?
Newbold Tunnel, The Oxford Canal, Newbold - two stop plank sheds.
We have taken immediate Badgers making banks of action to stem the breach with stop planks and are now working to establish the cause," he said.