I will not step down to be the dotard chamberlain of an upstart.
You see our dad Mr. Peregrin, he’s never had no truck with this Lotho, not from the beginning: said that if anyone was going to play the chief at this time of day, it would be the right Thain of the Shire and no upstart.
There are no more uses of "upstart" in the book.
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Even with a much more concealing mask, she would have recognized the upstart.