in a manner suggesting or moving along an edge; gradually or cautiously by degree.
From 'edge' with the gerund/present participle '-ing' and adverbial '-ly' suffix, creating a rare adverbial form suggesting movement along edges.
This is a 'rare' word that most English speakers never use—it's the kind of technically valid construction that looks awkward because we prefer simpler alternatives like 'gradually' or 'cautiously'.
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