The present participle of 'daub': applying paint, color, or other substances in a thick, crude, or careless manner.
From 'daub' (Old French 'dauber') plus '-ing' suffix. The gerund form shows ongoing or repeated action of coating or smearing.
Medieval churches used 'daubing' to describe whitewashing walls—it was literally the cheapest, fastest way to cover stone, and that's how so many murals got hidden for centuries!
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