A border or trim along the edge of something; moving slowly or gradually toward something.
From Old English 'ecg' (edge, point) + '-ing' suffix. The word has been used since before 1000 AD to describe the sharp side of objects, and the '-ing' form refers either to objects that form edges or to the action of moving inch by inch.
Edging is a perfect example of how one word can have completely different meanings depending on context—you can put edging on a garden bed (decoration) or use edging to move toward a door (a gradual action). This word shows how verbs and nouns often spring from the same root and develop separate lives.
Complete word intelligence in one call. Free tier — 50 lookups/day.