(of a person or body part) having a bruise or bruises.
"a bruised knee"
(of food) having been crushed or pounded.
"the mix contains bruised oats"
The colours which approach the dark side, and consequently, blue in particular, can be made to approximate to black; in fact, a very perfect Prussian blue, or an indigo acted on by vitriolic acid appears almost as a black.
—Johann Wolfgang von Goethe, Theory of Colours (1810)
Perhaps that’s because blue-black traces its roots back to a mythic point of origin in Africa, whereas “black,” along with “Negro” and “African-American,” might be considered just one more stopping point on the way to an as-yet-unknown destination.