"unfurled" meaning in English

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          "ref": "1955 January, R. S. McNaught, “From the Severn to the Mersey by Great Western”, in Railway Magazine, page 19:",
          "text": "As we stood waiting for the departure time with the setting sun twinkling on the great brass dome of our 2-4-0, the sound of church bells was the only one apart from the measured tread of the guard slowly pacing towards his van, and, standing at an open window, I more than once heard the fireman's \"Right away!\" to his mate in acknowledgement of a desultory wave of the unfurled green flag.",
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        "simple past and past participle of unfurl"
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