A bathtub or bath basin used for soaking; the tub in a home or ryokan (often used in phrases like 'to soak in the tub').
仕事の後でゆっくり湯船に浸かるのが楽しみだ。
I enjoy soaking slowly in the bathtub after work.
赤ちゃんを湯船に入れるときは湯加減に注意してあげてください。
When putting a baby in the bathtub, please pay attention to the water temperature.
旅館の大きな湯船で温泉を満喫した。
I fully enjoyed the hot spring in the ryokan's large bathtub.
狭いアパートなので湯船にゆったり浸かれないのが残念だ。
It's a shame I can't soak comfortably in a bathtub because my apartment is small.
Historically, a boat equipped with a bathtub rented out to customers (an Edo-period practice); an archaic/historical sense.
資料によると、江戸時代には湯船と呼ばれる貸し風呂船があった。
According to records, in the Edo period there were rental bath-boats called 'yubune'.