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underground

/,əndər'græʊnd/

Synonyms of underground Antonyms of underground Examples of underground Usage of underground Parts of underground Definition that contains underground Words sounding like underground Explanation of underground

adjective
conducted with or marked by hidden aims or methods
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"underground resistance"

Similar:

clandestine cloak-and-dagger hole-and-corner hugger-mugger hush-hush secret surreptitious undercover covert
noun
an electric railway operating below the surface of the ground (usually in a city)
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"in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'"

Similar:

metro subway subway system tube

type of:
railroad railroad line railway railway line railway system
noun
a secret group organized to overthrow a government or occupation force
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Similar:

resistance

type of:
revolutionary group
adjective
under the level of the ground
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"underground caverns"

Similar:

belowground subsurface

Examples of underground

"underground resistance"
"in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'"
"underground caverns"