Meaning

noun European freshwater game fish with a thick spindle-shaped body

originFrom chub (“short, thick fish species used as bait"; used metaphorically since 1558 for "lazy person”), from Middle English chubbe (“chub (the river fish)”), recorded since c.1450, probably an assibilated form of cub (“a lump, heap, mass”) and cob, from Middle English *cubbe (found only in derivative cubbel (“a block to which an animal is tethered”)), from Old Norse kubbr, kumbr (“block, stump,…

Etymology from Wiktionary, CC BY-SA 3.0