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Synonyms

underpass

American  
[uhn-der-pas, -pahs] / ˈʌn dərˌpæs, -ˌpɑs /

noun

  1. a passage running underneath, especially a passage for pedestrians or vehicles, or both, crossing under a railroad, road, etc.

underpass British  
/ ˈʌndəˌpɑːs /

noun

  1. a section of a road that passes under another road, railway line, etc

  2. another word for subway

"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

Etymology

Origin of underpass

First recorded in 1900–05; under- + pass

Vocabulary lists containing underpass

Florida's B.E.S.T. Common Prefixes: under-

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Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

On the morning of 6 April 2009, a lorry driver pulled off the M4 and parked in an underpass near Porthcawl, south Wales, and spotted a suitcase in an embankment.

From BBC • Feb. 7, 2026

Videos circulating on social media showed police vans escorting a bar association vehicle carrying Mazari to court before it was stopped at an underpass, where masked security officials prevented journalists from filming the arrest.

From Barron's • Jan. 24, 2026

Earlier in 2024, Essex County Council stressed it did not provide swimming equipment after a sign suggesting it would hand out flippers, masks and snorkels appeared at an underpass near the city centre.

From BBC • Oct. 9, 2025

In Wasco, for example, disagreements between the city and the authority over the creation of an underpass and other projects led to years-long delays on construction and increased costs.

From Los Angeles Times • Aug. 4, 2025

She stepped down and walked toward the underpass that cut across Darling Street.

From "Song of Solomon" by Toni Morrison

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.