bathroom · noun C /ˈbæθ.ruːm/
bathroom
A1 a room with a sink, a toilet, and often a bathtub and/or shower
Dictionary example:
The bathroom is right down the hall, on your left.
Learner example:
We have these three bedrooms, one kitchen, living room, and bathroom. (Skills for Life (Entry 1); A1; Polish)
go to the bathroom
A2 to empty the body of urine or solid waste, usually using a toilet in a bathroom
Dictionary example:
It's going to be a long ride, kids, so if you need to go to the bathroom do it now.
Learner example:
I left a history book in your house. It is important because I have to study. I think I left [it] in your house when you went to the bathroom. (Key English Test; A2; Spanish)