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- As to the percussion-caps, he had almost resolved, in the bitterness of his heart, that he would throw them into a neighboring pond; for not only was he the solitary pupil, but he began even to have a certain scepticism about guns, and a general sense that his theory of life was undermined.2.1 -- Book 2 Chapter 1 -- Tom's "First Half" (7% in)
There are no more uses of "undermine" in The Mill on the Floss.
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