go to the bath room

bathroom

[bath-room, -room, bahth-]
noun
1.
a room equipped for taking a bath or shower.
2.
toilet ( def 2 ).
Idioms
3.
go to/usethe bathroom, to use the toilet; urinate or defecate.

Origin:
1690–1700; bath1 + room

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bathroom (ˈbɑːθˌruːm, -ˌrʊm)
 
n
1.  a room containing a bath or shower and usually a washbasin and lavatory
2.  (US), (Canadian) another name for lavatory

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

bathroom
1780, from bath + room. Originally a room with apparatus for bathing, used 20c. in U.S. as a euphemism for a lavatory and often noted as a word that confused British travelers.
Online Etymology Dictionary, © 2010 Douglas Harper
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