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From The Collaborative International Dictionary of English v.0.48:
Dogwatch \Dog"watch`\, n. (Naut.) A half watch; a watch of two hours, of which there are two, the first dogwatch from 4 to 6 o'clock, p. m., and the second dogwatch from 6 to 8 o'clock, p. m. --Totten. [1913 Webster]