keystone

/ˈkiː.stəʊn/

noun

  1. 1

    The top stone of an arch.

  2. 2

    Something on which other things depend for support.

  3. 3

    A native or resident of the American state of Pennsylvania.

  4. 4

    (retail) A retail price that is double the cost price; a markup of 100%.

  5. 5

    The combination of the shortstop and second baseman.

verb

  1. 1

    To distort (an image) by projecting it onto a surface at an angle, which for example causes a square to look like a trapezoid.

  2. 2

    (retail) To double the cost price in order to determine the retail price; to apply a markup of 100%.

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