One of the mysteries of the English language finally explained.
A small wrasse, Centrolabrus exoletus, found off northern European coasts and occasionally in intertidal pools.
Mid 19th century; earliest use found in Magazine of Natural History. From rock + a second element of uncertain origin, perhaps a borrowing from Cornish kôg cuckoo; compare cuckoo, cuckoo-wrasse, and cook-wrasse, all denoting kinds of wrasse.
rock cook/ˈrɒk kʊk/
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