black-and-blue (bl?k??n-blo?o?)adj. Discolored from coagulation of blood below the surface of the skin.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.black-and-blue adj 1. (of the skin) discoloured, as from a bruise 2. feeling pain or soreness, as from a beating Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014black?-and-blue? adj. discolored, as by bruising. [1300?50] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.