noun
animal realm
Buddhist term: one of the six realms of rebirth (六道), where beings are driven by instinct and ignorance.
See also: 六道
仏教では、悪業を積むと畜生道に落ちると説かれる。
In Buddhism, it is taught that accumulating bad karma leads to rebirth in the animal realm.
noun
unforgivable act; indefensible lifestyle; incest
Figurative extension: a morally depraved state or act, likened to the animal realm. Sense 3 (incest) is a specific, rare usage.
そんな行為はまさに畜生道だ。
Such an act is truly unforgivable.
彼の生き方は畜生道そのものだった。
His way of life was utterly depraved.