Sunday Rest: restroom. Word To Use With Caution Today.

There may be nothing wrong with the word restroom as it stands, but a word of warning to American friends: if you go into a British pub or hotel and ask for the Men's Restroom then you are going to cause a great deal of hilarity.

Either that, or they'll show you to a bedroom.

And then charge you for it.

Word To Use With Caution Today: restroom. The Old English form of rest was reste or ræste. Before that the word seems to have described a distance, possibly a distance to be covered between two rests. 

Though how far that is, it's hard to imagine.