"under center" meaning in English

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      "expansion": "under center",
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        "Playing at the quarterback position."
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        "(American football) Playing at the quarterback position."
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        "(Of the quarterback) initiating play from immediately behind the center."
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        "(American football) (Of the quarterback) initiating play from immediately behind the center."
      ],
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  "word": "under center"
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        "(Of the quarterback) initiating play from immediately behind the center."
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        "(American football) (Of the quarterback) initiating play from immediately behind the center."
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