地下室 (dì xià shì) means “basement; cellar”. It is an HSK 6 Chinese word in the HSK 3.0 vocabulary.
Practice each character:
他们把地下室改成了书房。
Tāmen bǎ dì xià shì gǎi chéng le shūfáng.
They converted the basement into a study.
Updated: 2026-07-18