The Collaborative International Dictionary
Weever \Wee"ver\, n. [Probably from F. vive, OF. vivre, a kind of fish, L. vipera viper. Cf. Viper.] (Zo["o]l.) Any one of several species of edible marine fishes belonging to the genus Trachinus, of the family Trachinid[ae]. They have a broad spinose head, with the eyes looking upward. The long dorsal fin is supported by numerous strong, sharp spines which cause painful wounds.
Note: The two British species are the great, or greater, weever ( Trachinus draco), which becomes a foot long (called also gowdie, sea cat, stingbull, and weaverfish), and the lesser weever ( Trachinus vipera), about half as large (called also otter pike, and stingfish).
Wiktionary
n. Any of the usually brown fish in (taxlink Trachinidae family noshow=1), who catch prey by burying themselves in the sand and snatching them as they go past.
Wikipedia
Weevers (or weeverfish) are 9 extant species of fishes of family Trachinidae, order Perciformes. They are long (up to 37 cm), mainly brown in color, and have poisonous spines on their first dorsal fins and gills. During the day, weevers bury themselves in sand, just showing their eyes, and snatch prey as it comes past, which consists of shrimp and small fish. Weevers are unusual in not having swim bladders, as do most bony fish, and as a result, sink as soon as they stop actively swimming. With the exception of T. cornutus from the southeast Pacific, all species in this family are restricted to the eastern Atlantic (including the Mediterranean). A tenth, extinct species, Callipterus speciosus, is known from the Monte Bolca lagerstätte of the Lutetian epoch.
Weevers are sometimes used as an ingredient in the recipe for bouillabaisse.
Weevers are sometimes erroneously called 'weaver fish', although the word is unrelated. In fact, the word 'weever' is believed to derive from the Old French word wivre, meaning serpent or dragon, from the Latin vipera. It is sometimes also known as the viperfish, although it is not related to the viperfish proper (i.e., the stomiids of the genus Chauliodus).
In Australia, sand perches of the family Mugilidae are also known as weevers.
Usage examples of "weever".
There is something about all this that I do not understand: but if weever need to know it, you may be sure that we shall.
But what little she had overheard was enough to make her realise that, although these people might seem as decorative and harmless as parrot fish, they were really as dangerous as weevers, and would even turn on each other.