Roach, n.
1. Zool. (a) A European fresh-water fish of the Carp family (Leuciscus rutilus). It is silver-white, with a greenish back. (b) An American chub (Semotilus bullaris); the fallfish. (c) The redfin, or shiner.
2. Naut. A convex curve or arch cut in the edge of a sail to prevent chafing, or to secure a better fit.
As sound as a roach , perfectly sound.
Fall·fish n. Zool. A fresh-water fish of the United States (Semotilus bullaris); -- called also silver chub, and Shiner. The name is also applied to other allied species.
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