If she hoped to mollify him by this last concession the attempt was a failure, for he only replied, with the familiar lowering of the brows that made him look his dullest when he was angry: "Hang going to your aunt’s, and wasting the afternoon listening to a lot of other chaps talking to you!
There are no more uses of "mollify" in the book.
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She managed to mollify the angry customer.
She apologized, but he would not be mollified and he continued to insist on speaking with her manager.