On the edge; at the border or boundary; on edge.
From Old English prefix 'a-' (meaning 'on' or 'in') combined with 'edge', creating a position-based adverbial modifier.
Words like 'abedge' show how Old English built meanings through prefixes—a technique still alive in German but mostly abandoned in modern English!
Complete word intelligence in one call. Free tier — 50 lookups/day.