Etymology
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overpass (n.)

"stretch of road that passes over another," 1929, American English, from over- + pass (v.). + Overpass has been a verb since late c. 1300, "to go over, go across."

updated on November 03, 2019

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Definitions of overpass from WordNet

overpass (n.)
bridge formed by the upper level of a crossing of two highways at different levels;
Synonyms: flyover
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.