noun
floor below; lower floor
Refers to the floor directly beneath the current one, or a lower floor in a building. Often contrasted with 上階 (じょうかい, upper floor).
See also: 上階
下階から物音が聞こえる。
I can hear a noise from the floor below.
このビルの下階は駐車場になっている。
The lower floors of this building are used as a parking lot.