gast

Gast \Gast\ (g[.a]st), v. t. [OE. gasten, g[=ae]sten 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]