Past tense of 'cad' (to act as a cad, or to fish with caddis larvae); or describing something covered with or made of caddis materials.
Past tense of the verb 'cad', which derives from the noun 'cad' (caddis larva or the materials it uses). As fishing terminology, this verb developed from the practical activity of using caddis larvae, with '-ed' marking past action following standard English verb conjugation.
The word 'cad' has multiple meanings in English—a dishonorable man, a caddis larva, and a university servant in Cambridge. This overlap of meanings in historical English shows how the same word-sound could be used in completely different contexts depending on region and social class, with 'cadded' being the fishing version most people have forgotten.
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