a cockroach.-a european fresh-water fish of the carp family (leuciscus rutilus). it is silver-white, with a greenish back.-an american chub (semotilus bullaris); the fallfish.-the redfin, or shiner.-a convex curve or arch cut in the edge of a sail to prevent chafing, or to secure a better fit.-to cause to arch.-to cut off, as a horse's mane, so that the part left shall stand upright.