inroad
/ˈɪnroʊ.əd/Definitions
1. noun
a way or means of gaining an advantage or making progress, especially in a difficult or hostile situation.
“The company made an inroad into the competitive market with its innovative product.”
2. noun
a breach or incursion, especially into a person’s mind or emotions.
“Her grief was a bitter inroad into her normally cheerful personality.”