(figuratively) to make someone's blood run cold, to make someone's blood curdle

blood red (of a deep vivid red colour)

(idiomatic) to have blood on one's hands

hard enough to draw blood, until you draw blood

(figuratively) fit of anger, apoplexy

(transitive, informal, figuratively) to sandwich / (transitive, informal, figuratively) to double-team

blue blood (noble or aristocratic ancestry)

(informal) but of course! that's obvious, I can see that now! how did I not get that before?

blood brother (unrelated male considered to share a brother-like relationship established by a ceremonial sharing of blood)

(zoology, dated, of an animal) warm-blooded, endothermic, homeothermic