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| ADJ |
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| /ˈʌndəˌgraʊnd/ |
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| 1 | below the surface of the ground 地面下的 |
| an underground passage/tunnel/cable 地下通道/地道/地下电缆 |
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| 2 | secret and usually illegal 秘密的；地下的 |
| He had been a member of an underground resistance movement. 他曾经是地下抵抗运动的一名成员。 |
| | 2a | not well known by most people and different from what is usual or popular 不为大多数人所知的；非主流的；与众不同的 | |
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