IPA: /ˈkoʊstˌwaɪz/
KK: /ˈkoʊstˌwaɪz/
In a manner that follows or is along the coast.
The ship sailed coastwise to reach the next port.
Coastwise → It is formed from "coast" (from Old French *coste*, meaning the side or edge of land) and "-wise" (meaning in the manner of or direction). The word "coastwise" refers to something that is in the direction of or along the coast.
Think of the 'coast' as the edge of the land and '-wise' meaning in the manner of — so coastwise means in the direction of the coast.