[uhn-der-pas, -pahs]
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  1. a passage running underneath, especially a passage for pedestrians or vehicles, or both, crossing under a railroad, road, etc.

Origin of underpass

First recorded in 1900–05; under- + pass
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for underpass


  1. a section of a road that passes under another road, railway line, etc
  2. another word for subway (def. 1)
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

Word Origin and History for underpass

1904, American English, from under + pass (n.).

Online Etymology Dictionary, © 2010 Douglas Harper