flatfeet

/F L AE1 T F IY1 T/
noun
  1. 1

    (chiefly in the plural) A condition in which the arch of the foot makes contact with the ground

  2. 2

    A person having the above condition

  3. 3

    (law enforcement) (plural typically flatfoots) A policeman

Source: https://en.wiktionary.org/wiki/flatfeet, https://en.wiktionary.org/wiki/flatfoot