Where does “bloodbath” come from?

Bloodbath comes from English blood and bath, with bath deriving from Old English bæþ, Proto-Germanic blōþą, and ultimately Proto-Indo-European roots referring to swelling or flowing.

bloodbath (English): Indiscriminate killing or slaughter, a massacre;...

Definitions

  1. Indiscriminate killing or slaughter, a massacre;...

Ancestry of “bloodbath”, step by step

bloodbath traces back through two separate lines of ancestry.

via English Blood

StepLanguageWordMeaning
1EnglishBloodA member of the Los Angeles gang The Bloods
2Middle Englishbloodblood
3Old Englishblōdblood
4Proto-West Germanicblōdblood
5Proto-Germanicblōþąblood
6Proto-Indo-Europeanbʰleh₃-bloom, flower
7Proto-Indo-Europeanbʰel-to sound; to speak, roar, bark; shiny, white; to...
8Proto-Indo-Europeanbʰōl-

via English Bath

StepLanguageWordMeaning
1EnglishBathAn English marquisate
2Middle EnglishbaþAlternative form of bath
3Old Englishbæþbath; baptismal font
4Proto-West Germanicbaþbath
5Proto-Germanicbaþąbath
6Proto-Indo-Europeanbʰeh₁-to foment; warm; bathe
Every word from Proto-Indo-European bʰōl-Every word from Proto-Indo-European bʰel-Every word from Proto-Indo-European bʰleh₃-