upbuilding

/AH1 P B IH0 L D IH0 NG/
verb
  1. 1

    To build up (literally).

  2. 2

    To build up; to develop (figuratively).

noun
  1. 1

    The process of building something up; gradual development or accumulation.

Source: https://en.wiktionary.org/wiki/upbuild, https://en.wiktionary.org/wiki/upbuilding