| 地下 | di4 xia4 | covert |
| 地下室 | di4 xia4 shi4 | cellar |
| 地下水位 | di4 xia4 shui3 wei4 | underground water level |
| 轻轨 | qing1 gui3 | metro |
| 黑车 | hei1 che1 | underground taxi |
| 井下 | jing3 xia4 | in the pit (mining) |
| 隧 | sui4 | tunnel |
| 暗河 | an4 he2 | underground river |
| 地堡 | di4 bao3 | underground bunker |
| 仙宫 | xian1 gong1 | underground palace of ghouls, e.g. Asgard of Scandinavian mythology |
| 地下通道 | di4 xia4 tong1 dao4 | subway |
| 在地下 | zai4 di4 xia4 | underground |
| 地底 | di4 di3 | underground |