资料来源 : Webster's Revised Unabridged Dictionary (1913)

Agast \A*gast"\ or Aghast \A*ghast"\, v. t.
   To affright; to terrify. [Obs.] --Chaucer. Spenser.

Agast \A*gast"\, p. p. & a.
   See {Aghast}.