deep-sixing

/D IY1 P S AY0 K S IH0 NG/
verb
  1. 1

    To discard, get rid of, or cancel; to completely put an end to something.

    โ€œThey had put many hundreds of hours into the project before it was deep-sixed by management.โ€

Source: https://en.wiktionary.org/wiki/deep%20six, https://en.wiktionary.org/wiki/deep-six, https://en.wiktionary.org/wiki/deep-sixing