Hypertext Webster Gateway: "gast"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Gast \Gast\, v. t. [OE. gasten, g?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.
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