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1815 W. Burney Falconer's New Universal Dict. Marine (rev. ed.) Preventer-plate, a broad plate of iron, fixed below the toe-link of the chains to support them against the efforts of the masts and shrouds, having a chain-bolt driven through its upper end, and a preventer-bolt through the lower.

1874 S. J. P. Thearle Naval Archit. (new ed.) I. 60 The lower bar, which is fitted to give support to the bolt in the lower end of the upper bar, is known as a preventer plate.

1996 Hispanic Amer. Hist. Rev. 76 569 Shipping hardware is shown..in drawings that make clear the placement and function of such items as preventer plates and deadeyes.