An archaic or dialectal variation, possibly related to 'elling' or regional eel-fishing terminology with uncertain modern definition.
Possibly a variant of 'elling' with a regional suffix or phonetic change. The exact etymology is obscure, suggesting an obsolete or very localized dialectal term.
Ellinge might be a fossil word—one that survived just barely in old dialect records but has no living speakers anymore, like finding a plant species that only exists in pressed flowers from 200 years ago!
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