Hand Washing
Bathroom, Restroom, Lavatory
noun
You remember how 洗う is "to wash"? Well, when you wash your hands you're doing hand washing.
The readings are the vocab readings 手 and 洗う put together.
コウイチは何度言っても社員達が手洗い、うがいをしないので機嫌が悪い。
Koichi is angry with his workers because they don't wash their hands and gargle, regardless of how many times he's told them to do so.
お手洗いをお借りしてもいいですか？
Can I borrow your bathroom?
トーフグTシャツに洗濯機は使えません。手洗いをしなくてはいけません。
You can’t use a washing machine for Tofugu T-shirts. You have to wash them by hand.