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keystone
used in Lucky by Sebold

only 1 use
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Definition
something of importance upon which other things depend

or:

architecture or masonry:  the central building block at the top of an arch or vault (providing pressure to lock the other blocks into place)
  • I smiled at the idea of Diane and Mary Alice lifting up the RSA, his feet doing a wild walk in the air like a Keystone Kop.
    Chapter One (56% in)

There are no more uses of "keystone" in Lucky by Sebold.

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