Definition of southbound adjective from the Oxford Advanced Learner's Dictionary

 

southbound

 adjective
adjective
BrE BrE//ˈsaʊθbaʊnd//
 
; NAmE NAmE//ˈsaʊθbaʊnd//
 
 
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travelling or leading towards the south southbound traffic the southbound carriageway of the motorway
See the Oxford Advanced American Dictionary entry: southbound