BLOODBATH
bloodbath, bloodletting, bloodshed, battue
(noun) indiscriminate slaughter; “a bloodbath took place when the leaders of the plot surrendered”; “ten days after the bloodletting Hitler gave the action its name”; “the valley is no stranger to bloodshed and murder”; “a huge prison battue was ordered”
Source: WordNet® 3.1
Etymology
Noun
bloodbath (plural bloodbaths)
Indiscriminate killing or slaughter, a massacre.
(sports) An aggressive or very violent contest or confrontation.
(figuratively) An upset (as of a game with unexpected results, or a national presidential convention) or heavy defeat.
(figuratively, business) A large financial loss or massive layoff brought about by negative economic conditions.
A bath taken in warm blood used as a restorative or medical treatment.
Source: Wiktionary