a storage room, especially one for trunks, suitcases, etc.
Origin of box room
First recorded in 1925–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for boxroom
Historical Examples of boxroom
That night Hildebrand secretly slept in the boxroom, on a pile of newspapers, with a rag-bag and a hearthrug over him.
Looking out of the boxroom window was like looking down on the top of a green forest, Phyllis always thought.
a small room or large cupboard in which boxes, cases, etc, may be stored
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