or so·fa-bed, so·fa·bed
a sofa that can be converted into a bed, either by folding out the seat or by lowering the back to be flush with the seat.
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Origin of sofa bed
First recorded in 1810–20
Also called so·fa-sleep·er, so·fa/sleep·er [soh-fuh-slee-per] /ˈsoʊ fəˌsli pər/.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for sofa bed
a sofa that can be converted into a bed
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012