An archaic or dialect form meaning to grin or grimace, often with a mocking expression.
From Middle English and Old Norse origins, related to grinning or showing teeth in an unfriendly way. The -en ending is a past participle form common in older English.
This is the kind of word Shakespeare might have used! It shows how English once had many more verb forms, and regional dialects kept some of these old words alive long after standard English changed.
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