poor social relations between people (There's been bad blood between them for years.)

Bad Blood is a British made film, directed by Hettie Macdonald, and based on the memoir of the late Lorna Sage, a story of love, ambition and failure. The film features Academy Award nominee Miranda Richardson and Academy Award nominee John Hurt.

Bad Blood is a trade paperback collecting comic stories based on the Buffy the Vampire Slayer television series.

Bad Blood is the second and final album by Ice. The album is most notable for its fusion of industrial music and hip hop, as well as the number of guests on the album.

"Bad Blood" is the thirty-ninth episode of the American television series Prison Break and is the seventeenth episode of its second season. Regular cast members Wade Williams (Bellick) and Marshall Allman (LJ) do not appear in this episode, however it does feature the return of recurring guest stars Stacy Keach (Henry Pope, not seen since "Otis") and Camille Guaty (Maricruz Delgado, not seen since "Brother's Keeper").

Syphilis

a feeling of ill will arousing active hostility