IPA: /ˈkoʊstwərd/
KK: /ˈkoʊstwərd/
In the direction of the coast or toward the shore.
The ship sailed coastward to reach the harbor.
Coastward → It is formed from "coast" (from Old French *coste*, meaning the land beside the sea) and "-ward" (meaning in the direction of). The word "coastward" means in the direction of the coast or towards the coast.
Think of the word 'coast' as the land by the sea, and '-ward' indicating direction — so 'coastward' means moving towards the land by the sea.