The present participle of 'bedrape'; the act of covering or decorating with drapes.
From 'bedrape' + '-ing' (gerund/participle suffix). The '-ing' suffix converts the verb into a noun form or continuous aspect.
When you're 'bedraping' a stage, you're not just throwing a cloth over it—the 'be-' prefix suggests you're thoroughly covering it from top to bottom!
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