underground · noun /ˈʌn.də.graʊnd/
Word family
Nouns: ground, underground, grounding
Adjectives: groundless, underground
Verbs: ground
Adverbs: underground
the underground
A2 the system of trains that is built under London
Dictionary examples:
the London Underground
Take the underground to Green Park.
Learner example:
Take the underground [to] Camden Town station. (Key English Test; A2; French)
underground · adjective /ˌʌn.dəˈgraʊnd/
Word family
Nouns: ground, underground, grounding
Adjectives: groundless, underground
Verbs: ground
Adverbs: underground
underground
B2 below the surface of the ground
Dictionary examples:
an underground cave/passage
Some animals, such as moles, live underground.
Learner example:
As it was expected, Harry was seen, and then he went underground t[h]rough a tunnel which crossed from the inner city to the Russian zone. (First Certificate in English; B2; Spanish)
