Webster’s Revised Unabridged Dictionary · 1913
Fash
Fash (făsh), v. t. [imp. & p. p. Fashed; p. pr. & vb. n. Fashing.] [OF. faschier, F. fâcher, to anger, vex; cf. Pr. fasticar, fastigar, fr. L. fastidium dilike. See Fastidious.] To vex; to tease; to trouble. [Scot.]
Fash, n. Vexation; anxiety; care. [Scot.]
Without further fash on my part. De Quincey.