Eighthman

Border's captain Basil Kenyon, at eighthman, again impressed with his intelligent positional play, and general leadership - as he had done in the shock win earlier in the tour.

Source: wiktionary

Table VI I A, which is read horizontally, shows that concussion and ligament injuries are commonest among eighthmen and fullbacks; that muscle injuries and fractures are fairly evenly distributed across all playing positions; that internal injuries are most frequent among scrum-halves, but are also common in fly-halves and full-backs; and that bone bruises are most frequent among fly-halves, centres and wings, whereas dislocations are commonest among hookers and prop-forwards.

Source: wiktionary

Du Plessis was shifted from eighthman to flank for the second test and then was dropped altogether, although he fared better than most.

Source: wiktionary

The ball moved to the eighthman; he waited for it to come out. SOTS scrum-half Jood pounced and began his pass, but swift as he was, Thorn Thompson was swifter. Shouldering his own leaden-footed scrum-half aside, Thorn dived atop quicksilver Jood with a bone crunching tackle. Thorn's heart pounded in his breast, he'd finally bested his hated boyhood rival. Then the whistle went. Thorn stared stupidly at the ball, still at the eighthman's feet.

Source: wiktionary