两个防守前卫之一，位置在争球线一段短距离之后，相对来讲靠近边界线。

Either of two defensive halfbacks stationed a short distance behind the linebackers and relatively near the sidelines.

youdao

世界杯前锋、前卫、后卫防守技术运用全面、合理，中超联前锋、前卫、后卫防守不积极，各自单兵作战，缺乏有效的配合。

While in World Cup, forward, midfielder and back apply defence fully and reasonably; in CFASL, the players are passive, separate and in lack of effective coordination.

youdao