- 地下室 dìxiàshì basementa room or rooms situated partially or entirely below the ground level of a building
- 地下水 dìxiàshuǐ groundwater
- 地下道 dìxiàdào underpassunderground passage; underpass
- 地下茎 dìxiàjīng underground stem(botany) underground stem
- 地下街 dìxiàjiē underground mallan underground shopping arcade or mall
- 地下通道 dìxiàtōngdào underpassunderground passage; underpass
- 地下钱庄 dìxiàqiánzhuāng loan sharkan illegal private lending operation that provides loans at predatory or extremely high interest rates
- 地下铁路 dìxiàtiělù subwaysubway; metro; underground railway
- 人行地下通道 rénxíngdìxiàtōngdào underpasspedestrian underpass
- 转入地下 zhuǎnrùdìxià go undergroundto move activities into secrecy or clandestine operations, typically to avoid detection or persecution
- 在地下 zàidìxià underground
- 地下情 dìxiàqíng secret affaira secret love affair
- 地下核爆炸 dìxiàhébàozhà underground explosionthe detonation of a nuclear device beneath the surface of the earth
- 地下核试验 dìxiàhéshìyàn underground nuclear test
