night pool; pool open at night
Refers to a swimming pool that operates at night, often with lighting, music, and a party atmosphere. A wasei-eigo term; not a direct borrowing from English.
wasei-eigo (Japanese-coined English), from night pool
In summer, night pools at hotels in Tokyo are popular.
I went to a night pool with friends and swam while listening to music.
Wasei-eigo from English 'night' and 'pool'. The term is not used in English with the same party-oriented meaning.