It refers to the side areas of the pitch, as opposed to the centre. So an attack down the wing would involve most of the play being closer to one side of the pitch for example. A player that is described as "playing on the wing" spends most of their time closer to the edge of the pitch.
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The right and left sides of the 3pt line or inside the 3pt line. It's not the painted area and it's not the corner and it's not the middle or top of the key