Webster's Revised Unabridged Dictionary · 1913

Fash

Fash , transitive verb

[Old French faschier, French f{not transcribed}cher, to anger, vex; compare Pr. fasticar, fastigar, from Latin fastidium dilike. See Fastidious.]

To vex; to tease; to trouble. [Scottish]

Fash , noun

Vexation; anxiety; care. [Scottish]
Without further fash on my part. — De Quincey