Source : Webster's Revised Unabridged Dictionary (1913)

Fash \Fash\, v. t. [imp. & p. p. {Fashed}; p. pr. & vb. n.
   {Fashing}.] [OF. faschier, F. f?cher, to anger, vex; cf. Pr.
   fasticar, fastigar, fr. L. fastidium dilike. See
   {Fastidious}.]
   To vex; to tease; to trouble. [Scot.]