Longman Dictionary of Contemporary English homepage

underground

2 adverb
     
un‧der‧ground2
1 under the earth's surface:
This animal spends most of its life underground.
nuclear waste buried deep underground
2

go underground

to start doing something secretly, or hide in a secret place:
The ANC was forced to go underground when its leaders were arrested.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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