edge
n. countable B1 Intermediate Oxford US //ˈɛdʒ// UK //ˈɛdʒ// edge
n. the outside limit or border of something. It can also mean a small advantage you have over someone else.
n. the outside limit of an object, area, or surface; a point furthest from the centre. In a competitive context, it refers to a slight advantage over a rival.
Do not leave your glass near the edge of the table.
The athlete's superior training gave her a competitive edge over the other runners in the final sprint.
The hikers stood cautiously at the cliff's edge, peering down into the valley where the morning mist still clung to the dense canopy of trees.
Usage
Often used with the definite article 'the' when referring to a physical border; used with 'an' or 'the' when referring to an advantage.