blood-letting

/B L AH1 D L EH0 T IH0 NG/
noun
  1. 1

    The archaic practice of treating illness by removing some blood, believed to be tainted, from the stricken person.

  2. 2

    (by extension) The diminishment of any resource with the hope that this will lead to a positive effect.

    โ€œYet another round of corporate bloodletting.โ€

  3. 3

    A circumstance, such as a battle, where a large amount of blood is likely to be spilled through violence.

Synonyms

Source: https://en.wiktionary.org/wiki/blood-letting, https://en.wiktionary.org/wiki/bloodletting