IPA: /ˈɪnroʊd/
KK: /ˈɪnroʊd/
A sudden and often aggressive entry or invasion into a place, usually causing disruption or damage.
The company made significant inroads into the market last year.
Inroad is formed from "in-" (meaning into) and "road" (from Old English "rād", meaning a way or path). The word describes an incursion or invasion into a territory, suggesting movement into a space or area.
Think of moving 'into' ('in-') a 'path' ('road') — that's why inroad means an incursion into a territory.