Hi, It's the preposition needed after edge (when edge means advantage ): edge + over + somebody. Cambrigde Dictionary: edge : an advantage over other people In terms of experience, she definitely had the edge over the other people that we interviewed. LDOCE edge (singular, uncountable) something that gives you an advantage over others: Companies are employing more research teams to get an edge.
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PhilipI'm sure that 'over' has the edgePhilip, you always have me on the edge of my seat. I'll keep that in mind.