Origin of underground

First recorded in 1565–75; under- + ground1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for underground

British Dictionary definitions for underground


adjective (ˈʌndəˌɡraʊnd)

occurring, situated, or used below ground levelan underground tunnel; an underground explosion
secret; hiddenunderground activities

adverb (ˌʌndəˈɡraʊnd)

going below ground levelthe tunnel led underground
into hiding or secrecythe group was driven underground

noun (ˈʌndəˌɡraʊnd)

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