Present participle of draggle; trailing through mud or water; making something wet and dirty by dragging it.
From 'draggle' with the '-ing' suffix, used as both a gerund (noun form of a verb) and a present participle (ongoing action). The form preserves the original sense of repeated or continuous dragging.
The '-ing' form of 'draggle' appears in old literature describing children and servants moving through wet farmyards—it's the sound and sight combined into one word, almost onomatopoetic.
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