Archaic or dialectal term with uncertain meaning; possibly a gerund form related to copple or a noun describing a geographical or architectural feature.
Likely formed from copple with the gerund suffix -ing, indicating an action or state, though the word has fallen out of usage and its precise original meaning is unclear.
Coppling appears occasionally in medieval texts but without context it's impossible to know exactly what people meant—it's like finding a word in a foreign language with no dictionary!
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