un·der·pass 
/ˈʌndɚˌpæs, Brit ˈʌndəˌpɑ:s/ noun
plural un·der·pass·es /ˈʌndɚˌpæs, Brit ˈʌndəˌpɑ:s/ noun [count] : a place where a road or railroad crosses under another road or railroad
▪ We stood on the bridge and looked down at the underpass. — compare overpass
▪ We stood on the bridge and looked down at the underpass. — compare overpass
