1. traveling or leading toward the south

1. in a southward direction

Examples

• The southbound train leaves at 3:15 PM.
• Traffic on the southbound highway was heavy during rush hour.
• We took the southbound exit to reach the beach.
• The birds were flying southbound for the winter.
• All southbound lanes were closed due to construction.
• The southbound journey took us through three states.
• She drove southbound on Interstate 95.