An archaic or dialectal verb meaning to engage in the sale of haberdashery goods, or to work as a haberdasher.
Back-formation from 'haberdasher,' with -dash being influenced by the original word's final syllable. The verb form is quite rare and largely obsolete.
'Haberdash' is almost never used today, but it shows how English speakers used to turn nouns into verbs freely—you could 'haberdash' like you might 'garden' or 'fish.'
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