big bang

/B IH1 G B AE0 NG/
noun
  1. 1

    An explosion giving rise to a universe.

    โ€œMillions of big bangs may be happening as we speak.โ€

  2. 2

    In project management, a project that has no staged delivery. The customer must wait, sometimes months, before seeing anything. At the end of the wait comes a "big bang".

Source: https://en.wiktionary.org/wiki/big%20bang