Webster's English Dictionary

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quarterback

1. quar.ter.back \'kwo.(r)t-*r-.bak, 'kwo.rt-*-.bak\ n : a backfield player 
   in football who calls the signals and directs the off ensive play of his 
   team
2. quarterback vt 1: to call the signals and direct the offensive play of 
   (a football team)  2: to give executive direction to : BOSS