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Origin of underground

First recorded in 1565–75; under- + ground1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use underground in a sentence

British Dictionary definitions for underground

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)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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