The group had two hours to wait between trains and, as it was taxing the diplomacy of the sober members of the party to keep the Fontaines from fighting each other and perfect strangers in the depot, Ashley brought them all home to Aunt Pittypat’s.
It had taken all of Melanie’s diplomacy to persuade them to defer their decision.
There are no more uses of "diplomacy" in the book.
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She’s not known for her diplomacy.
Diplomacy is the art of saying "Nice doggie" until you can find a rock.