running back

noun Football.
an offensive back, as a halfback or fullback, whose principal role is advancing the ball by running with it on plays from scrimmage.
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WordNet
running back

noun
(football) a back on the offensive team (a fullback or halfback) who tries to advance the ball by carrying it on plays from the line of scrimmage 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
He ran in a two-point conversion to tie the game, unwittingly suggesting that
  running back might be a more natural position.
In football he played safety, offensive running back and punter.
Now imagine that the lion is a linebacker and the gazelle is a fleet-footed
  running back.
Since there was a lot to be worked out, all the kids kept running back to the
  picnic table to decode, then back out to the field.
Images for running back
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