A dialectal or archaic word for a whelk (a small sea snail), or a person considered worthless or contemptible in some regional dialects.
A variant or corruption of 'whelk' or possibly from dialectal usage in British English. The etymology is unclear but may relate to old Germanic roots for shellfish or could be purely dialectal.
Regional words like 'wilk' show how English fractures into dozens of local varieties—what one community calls by one name, another completely forgets, and within a century the word can vanish entirely.
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