Definition of Underground

in secrecy of hiding

Examples of Underground in a sentence

The underground fighting ring is technically illegal, so they must keep it a secret from law enforcement if they wish to continue.  🔊

There was no longer any real war being waged on the oppressed nation’s soil, but an underground resistance was still fighting back where they could.  🔊

With the guards cracking down on gambling, we had to venture to an underground gambling den to engage in our favorite hobby.  🔊

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