- go to/usethe bathroom, to use the toilet; urinate or defecate.
- a room containing a bath or shower and usually a washbasin and lavatory
- US and Canadian another name for lavatory
1780, from bath + room (n.). 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. To go to the bathroom, euphemism for “relieve oneself; urinate, defecate,” from 1920 (in a book for children), but typically used without regard for whether an actual bathroom is involved.