bed and breakfastn. Abbr. B & B A private residence, several rooms of which are set aside for overnight guests whose paid accommodations include breakfast.bed?-and-break?fast adj.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.bed and breakfast n (in a hotel, boarding house, etc) overnight accommodation and breakfast adj (Stock Exchange) (of a stock-exchange transaction) establishing a loss for tax purposes, shares being sold after hours one evening and bought back the next morning when the market opens Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014