wingback
A football (soccer) position; a player who operates on the flank, combining defensive and attacking duties, typically in a formation with three center-backs.
彼はウイングバックとして攻守に貢献した。
He contributed to both attack and defense as a wingback.
サイドバック is a full-back in a back four, while ウイングバック is a more attack-minded wide player in a back three/five system.
Borrowed from English 'wingback'.