To remove plaster or a plaster coating from a surface.
From 'de-' (away/off) + 'plaster' (from Latin 'plastrum'). The word combines the removal prefix with plaster, appearing in construction and renovation terminology from medieval times onward.
When you're renovating an old house and need to tear off plaster walls, that messy job is technically 'deplastering'—though nobody actually says it because 'removing plaster' is way easier to pronounce.
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