南来北往

Explanation: Some from south to north, some from north to south. Also refers back and forth. 　　Usage: Joint type; as attribute, clause; that come and go 　　Source: Song Ye Shi "road Shu": "north-south, He You drag mud with water; North Korea to the twilight years, less than hit head knock the brain." Thesaurus:  arrivals and departures, South to North to