An archaic or dialectal term for the action of covering or roofing, particularly with thatch or slate, as in covering a house.
From Old English 'hele' (to cover or conceal) plus '-ing' suffix for the action, related to modern 'heal' in the sense of making whole by covering.
Heling is the kind of word you'd find in medieval documents about building—it's the ancestor of how we still say we 'roof' or 'thatch' buildings!
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