How long before we have to be back to the bus from the bathroom? There is a long line, so I’m worried I’ll be late.
You know 手洗い, right? This is like that, but way more polite sounding. The meaning is still the same though: restroom, bathroom, toilet.
The reading for the 御 is お, the rest is てあらい, even though the い isn't showing on the end. It gets pushed into the 洗い.