undergrounds

noun

an electric railway operating below the surface of the ground (usually in a city)

a secret group organized to overthrow a government or occupation force

adjective

conducted with or marked by hidden aims or methods

under the level of the ground

adverb

beneath the surface of the earth

in or into hiding or secret operation

Roots

underunder- · Old English · beneath, below

Synonyms & related words for undergrounds

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Words related to undergrounds

Explore words related to undergrounds — words associated with it, words that go with it, and its nearest matches in meaning. Related words include hypogeal, belowground, subterraneously, subterrene, subterranean, hypogeous, subway, metro. Click any word to make it the center of the map and keep exploring the web of connections.

Where does undergrounds come from?

The word undergrounds breaks down into one root of Old English origin: the root under-, from Old English under (“beneath, below”). Explore each root to see other English words built from the same source.