To cover or wrap with paper.
From em- (cause to be) + paper. The word combines the causative prefix with 'paper' to create a verb meaning to apply paper to something.
This word is practically obsolete now because we say 'paper' as a verb directly ('to paper a wall'), showing how English naturally sheds redundant prefixes—we don't say 'encover' for cover or 'enclose' for close (well, actually we do for some!), but 'empaper' lost that battle.
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