Definition of "black-blue" []

• A blue so dark that it is nearly black. Similar to blue-black. (noun)

The Century Dictionary (Public Domain)

• "Her hands were stained that purple-blue, and her lips were ringed black-blue, and a once-plump blueberry teetered on her tongue, staining her teeth as gray as a November sky."
• "At her nephew's nuptials which, in accordance with Jerusalem custom, took place outdoors, under a chuppah (wedding canopy), Stewart said she was moved by "that black-blue sky and that breeze, with the chuppah and tallit (prayer shawl) with the navy-blue stripes and the olive trees holding up the chuppah.""
• "At a bit past two, with gelled-back hair, a wave right down the middle, the Members Only jacket he got back after leaving prison, and Wrangler jeans still black-blue, he headed out, driving toward the place where he hoped to see his son."