Etymology
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fullback (n.)

also full-back, 1882 in sports, from full (adj.) + back (n.).

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Definitions of fullback
1
fullback (n.)
(football) the running back who plays the fullback position on the offensive team;
fullback (n.)
(American football) an offensive position in the backfield;
2
fullback (v.)
play the fullback;
From wordnet.princeton.edu