Wiktionary
n. (running back English)
Usage examples of "running backs".
Those were the days when quarterbacks were more like running backs and you played both sides.
There were pictures of thoroughbreds crashing toward finish lines, running backs smashing into end zones, soccer players making head contact with flying balls, masked goalies deflecting slap shots, a bowler goosing air with his thumb while a triangle of pins blew apart, many glossy photos of baseball greats diving at bases, fielding impossible drives, swinging blurred bats against blurred balls.
It would have been easy to call them oafish and awkward, but the running backs and others demonstrated speed and agility that one might never have guessed.
In the game of football, he pointed out, black people were often valued as wide receivers and running backs, but coaches were resistant to making them quarterbacks.
This kid was one of the best natural running backs he'd ever seen.