One of the mysteries of the English language finally explained.
1North American. Any of several sticklebacks. rare.
2Either of two porgies of shallow waters on the eastern and Gulf coasts of the United States: Lagodon rhomboides, which has a dark spot on the lateral line behind the gill cover, and (more fully "spottail pinfish") Diplodus holbrooki, which has a black saddle on the caudal peduncle.
Mid 19th century; earliest use found in Henry Ward Beecher (1813–1887). From pin + fish, with reference to the sharp dorsal spines of these fishes.
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