GNU Collaborative International Dictionary of English

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1.       
   Gast , v. t. [OE. gasten, gǣsten to frighten, akin to Goth. usgaisjan. See Aghast, Ghastly, and cf. Gaze.] To make aghast; to frighten; to terrify. See Aghast. [Obs.]
   Chaucer. Shak.
   
   1913 Webster