Similarly, during two or three hours of drawl, and the winnowing of many bushels of words, Madame Defarge’s frequent expressions of impatience were taken up, with marvellous quickness, at a distance: the more readily, because certain men who had by some wonderful exercise of agility climbed up the external architecture to look in from the windows, knew Madame Defarge well, and acted as a telegraph between her and the crowd outside the building.
There are no more uses of "agile" in the book.
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She is amazingly agile for someone so tall.
Her agility allows her to guard even the quickest ball handlers.