The bathroom lingo is different wherever you go.
When you've really got to go, there’s no time for a language barrier. Familiarize yourself with local lingo when asking for the bathroom. Overall, the word "toilet" is more widely used and understood than "bathroom" or "restroom," as people say in the U.S. In Canada, it's a "washroom."
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In England, it's a "W.C." (short for "water closet") or a "loo." You can use "W.C." or "toilette" throughout Europe. In Australia, don't be surprised to hear the word "dunny." And when you're in Japan, you can call it a "benjo" in informal situations.