changeup

/CH EY1 N JH AH0 P/
noun
  1. 1

    A pitch thrown with the arm motion of a fastball, but which travels at a much slower velocity because it is released without the fingers adding power to the delivery.

    The pitcher had a devastating change-up.

  2. 2

    (by extension) An unexpected event.

    This RFQ is a real change-up.

Source: https://en.wiktionary.org/wiki/change-up, https://en.wiktionary.org/wiki/changeup