An archaic or dialectal term, possibly meaning to irritate with nettles or to sting, though it is extremely rare and obscure.
Possibly from 'be-' (prefix meaning to cause) combined with 'nettle' (a stinging plant, Old English 'netle'). The exact etymology and usage are uncertain due to its rarity.
This might be the most obscure word on your list—even in specialized historical dictionaries, 'benettle' barely appears, showing that even our oldest English texts have forgotten words we'll never fully understand.
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