An archaic or dialectal past participle of 'frown,' meaning to have contracted one's brow in disapproval or anger.
From Old English 'frownian' or similar Germanic roots. This spelling represents an older or regional English pronunciation pattern that has largely fallen out of modern standard use.
English spelling and pronunciation evolved dramatically after the printing press was invented—scribes had different conventions, which is why you find variant spellings like 'frawn' for 'frown' in older manuscripts before standardization really took hold.
Complete word intelligence in one call. Free tier — 50 lookups/day.