say it: HAF-bak
halfback is a noun meaning "(football) the running back who plays the offensive halfback position". It carries 2 recorded senses.
(American football) an offensive back usually positioned behind the quarterback and to the side of the fullback
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for halfback come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.