That ass, Pumblechook, used often to come over of a night for the purpose of discussing my prospects with my sister; and I really do believe (to this hour with less penitence than I ought to feel), that if these hands could have taken a linchpin out of his chaise-cart, they would have done it.
There are no more uses of "linchpin" in the book.
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She is the linchpin of this firm.
The Senate Finance Committee is the legislative linchpin for much important legislation.