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plural fishweirs
An obstruction placed in tidal waters, or wholly or partially across a river, to trap fish or hinder their passage. quotations examples
A chap named Eleazir Kendrick and I had chummed in together the summer afore and built a fish-weir and shanty at Setuckit Point, down Orham way. For a spell we done pretty well.
1913, Joseph C. Lincoln, chapter 1, in Mr. Pratt's Patients