One who fashes; a person or thing that causes worry, bother, or annoyance (dialectal).
From 'fash' plus the agent noun suffix '-er,' indicating someone or something that causes the action of fashing.
Though rarely used in modern English, 'fasher' would have been understood in 19th-century Scotland as someone who was annoying or troublesome—regional dialects developed rich vocabularies for everyday social dynamics.
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