The phrase "opposition wingers" refers to players on the opposite team in a sports game, who typically play on the sides of the field or court. They try to move quickly and pass the ball to their teammates to score goals or points. Full definition
No matter who he plays against, he is always a nuisance to d opposition wingers. (sbnation.com)
Playing a back - 3 provides Barcelona an extra defender and free player to bring the ball out of the back, allows their wingbacks to play aggressively knowing they have extra defensive cover to pin back opposition wingers, affords a three versus two advantage and defensive cover against counter-attacks, and gives Barcelona the extra size to help defend against set pieces where their opposition have always planned to attack. (laligablog.com)
In the modern game a full back is so much more of an attacking option but their major role is to limit the usefulness of opposition wingers. (justarsenal.com)