mousing, n.
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The act of hunting mice. [1913 Webster]
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A turn or lashing of spun yarn or small stuff, or a metallic clasp or fastening, uniting the point and shank of a hook to prevent its unhooking or straighening out. [1913 Webster]
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A ratchet movement in a loom. [1913 Webster]
Mousing hook, a hook with an attachment which prevents its unhooking.