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underframe
underfur
undergarment
undergird
underglaze
undergo
undergrad
undergraduate
underground
Underground Railroad
underground railroad
underground railway
undergrown
undergrowth
underhand
underhanded
underhung
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underground

un·der·ground [ úndər gròwnd ]


adjective 
Definition:
 
1. beneath Earth's surface: located, happening, or operating beneath the surface of the Earth

2. covert: concealed and done in secret

3. contrary to prevailing culture: separate from a prevailing social or artistic environment, and often exercising a subversive influence
The story had been circulating in the underground press.



noun 
Definition:
 
1. resistance movement: a secret movement that aims to overthrow a government or fight against an occupying enemy

2. movement contrary to prevailing culture: a movement or group that is separate from the prevailing social or artistic environment and often exerts a subversive influence

3. U.K. rail 
Same as  subway (sense 1)




adverb 
Definition:
 
1. below ground: below the surface of the ground

2. secretly: in secret or in hiding

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