IPA: //ˈsiːweɪ//
KK: /ˈsiːweɪ/
A route or passage in the sea that ships use for travel or transportation.
The cargo ship navigated through the busy seaway to reach the port.
Seaway → It is formed from "sea" (from Old English "sǣ", meaning large body of saltwater) and "way" (from Old English "weg", meaning path or route). The word "seaway" refers to a route or path through the sea.
Picture a path or route ('way') that goes through a large body of saltwater ('sea') — that's what a seaway is.