IPA: /ˈiːstˌbaʊnd/
KK: /ˈistˌbaund/
Moving or traveling in the direction of the east.
The train is eastbound and will arrive in the morning.
**Eastbound** → It is formed from "east" (from Old English *ēast*, meaning the direction of the sunrise) and "bound" (from Old English *bund*, meaning tied or destined). The word "eastbound" refers to being directed or traveling towards the east.
Think of the direction of the sunrise ('east') and being 'tied' or 'destined' ('bound') to that direction — that's why eastbound means heading towards the east.