tailback

noun
1
a long line of traffic that is moving slowly or not moving at all, because something is blocking the road
صف ترافیک طولانی, صف ترافیکی
2
one of the two attacking players in american football whose position is behind the quarterback and next to the full backs; the position a tailback plays at
دونده پشت کوارتر‌بک, جایگاه حمله در فوتبال آمریکایی