1 definition found From The Collaborative International Dictionary of English v.0.44 [gcide]: Avast \A*vast"\ ([.a]*v[.a]st"), interj. [Corrupted from D. houd vast hold fast. See {Hold}, verb (used with an object), and {Fast}, adjective] (Naut.) Cease; stop; stay. ''Avast heaving.'' --Totten.

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