Watson's Biblical & Theological Dictionary
a part or suburb of Jerusalem. "David built round about from Millo and inward," 2 Samuel 5:9; that is, he built round about from the place where Millo was afterward erected by Solomon, or where more probably the senate house, or Millo of the Jebusites, had stood, which was pulled down to make room for the more sumptuous edifice of Solomon, to his own house; so that David built from Mount Zion, quite round to the opposite point. Hence, the residence of David, even in the reign of that renowned monarch, began to assume the size and splendour of a city.
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Watson, Richard. Entry for 'Millo'. Richard Watson's Biblical & Theological Dictionary. https://www.studylight.org/dictionaries/eng/wtd/m/millo.html. 1831-2.