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What is "as sound as a roach"

The Collaborative International Dictionary
As sound as a roach

Roach \Roach\, n. [OE. rroche; cf. AS. reohha, D. rog, roch, G. roche, LG. ruche, Dan. rokke ray, Sw. rocka, and E. ray a fish.]

  1. (Zo["o]l.)

    1. A European fresh-water fish of the Carp family ( Leuciscus rutilus). It is silver-white, with a greenish back.

    2. An American chub ( Semotilus bullaris); the fallfish.

    3. 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 [roach perhaps being a corruption of a F. roche a rock], perfectly sound.