noun
one's own bath; private bath
A bath reserved for one's own use, as opposed to a shared bath. Often used in the context of traditional inns or bathhouses where a bath can be rented privately.
See also: 留風呂
旅館で留め湯を頼んだ。
I reserved a private bath at the inn.
noun
reusing yesterday's bath water
Refers to the practice of keeping and reusing bath water from the previous day, often by reheating it. Common in households where water is conserved.
うちでは留め湯にして、翌日も同じお湯を使う。
At our house, we keep the bath water and use it again the next day.
noun
monthly pass for a public bath
A subscription or pass allowing unlimited use of a public bath for a month. Now mostly historical, as public baths have declined.
昔は留め湯を買って、毎日銭湯に通ったものだ。
In the old days, people would buy a monthly pass and go to the public bath every day.
留風呂 is a synonym for 留め湯, also meaning a private bath or reserved bath. 留め湯 is more common.
Compound of 留め (tome, 'stopping, keeping') + 湯 (yu, 'hot water'). The exact historical derivation is uncertain, but the word refers to water that is kept or reserved.