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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

Definition that contains underground

peanut underground pod of the peanut vine
aquifer underground bed or layer yielding ground water for wells and springs etc
water table underground surface below which the ground is wholly saturated with water
ground water underground water that is held in the soil and in pervious rocks
groundwater level underground surface below which the ground is wholly saturated with water
spring water underground water that is held in the soil and in pervious rocks
water level underground surface below which the ground is wholly saturated with water
well water underground water that is held in the soil and in pervious rocks