"quarterback" in the noun sense
1. quarterback, signal caller, field general
football) the person who plays quarterback
2. quarterback, signal caller, field general
American football) the position of the football player in the backfield who directs the offensive play of his team
"quarterback is the most important position on the team"
"quarterback" in the verb sense
play the quarterback
Source: WordNet® (An amazing lexical database of English)
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