"sunning" meaning in English

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  "pos": "verb",
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        {
          "ref": "2008, Wally Lamb, The Hour I First Believed, Ch.3, at p.62-63",
          "text": "I passed from the jaundiced lighting of the parking garage to the halogen glare of the walkway. Passed two porters, slumped on plastic chairs. Both glanced at my carry-on luggage, then blinked me away, as disinterested as sunning lizards."
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        "present participle and gerund of sun"
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  "word": "sunning"
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          "ref": "2008, Wally Lamb, The Hour I First Believed, Ch.3, at p.62-63",
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