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underground

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1underground/ˈʌndɚˌgraʊnd/adjective
1underground
/ˈʌndɚˌgraʊnd/
adjective
Learner's definition of UNDERGROUND  
: located or occurring below the surface of the earth
— compare abovegroundinground
always used before a noun : secret and usually illegal
always used before a noun : of, relating to, or produced in a social and artistic world that is different and separate from the main part of society
2underground/ˌʌndɚˈgraʊnd/adverb
2underground
/ˌʌndɚˈgraʊnd/
adverb
Learner's definition of UNDERGROUND  
: below the surface of the earth
: in or into a place that is hidden or secret: out of the view of the public
3underground/ˈʌndɚˌgraʊnd/noun
3underground
/ˈʌndɚˌgraʊnd/
noun
Learner's definition of UNDERGROUND  
British : a system of trains that run below the ground in a large city
: subway
[singular]
[noncount]
the underground : a group of people who secretly work to oppose or overthrow a government
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