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inroad (n.)

1540s, "hostile incursion, raid, foray," from in- (2) "in;" second element is road (n.) in the obsolete sense of "riding;" related to raid (v.). Related: Inroads.

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Definitions of inroad

inroad (n.)
an encroachment or intrusion;
they made inroads in the United States market
inroad (n.)
an invasion or hostile attack;
From wordnet.princeton.edu