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- Dictionaryunderground
adverb
- 1. beneath the surface of the ground: "miners working underground" Similar
adjective
- 1. situated beneath the surface of the ground: "an underground car park" Similar Opposite
noun
- 1. an underground railway, especially the one in London: British "travel chaos on the Underground" Similar
- 2. a group or movement organized secretly to work against an existing regime: "the French underground" Similar
verb
- 1. lay (cables) below ground level: "sections of electricity line had been undergrounded"
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