名詞 inroad:

1. an encroachment or intrusion
2. an invasion or hostile attack

1. Hospital bills had made deep inroads into her savings.
   住院的花銷用去她一大筆積蓄。
2. Already the children had made considerable inroads on the food.
   孩子們早已吃掉不少食物。

in.road

n.（名詞）
A hostile invasion; a raid.
襲擊：一場惡意的侵略；一場襲擊
An advance, especially at another`s expense; an encroachment. Often used in the plural:
侵害：進展，尤指以別人的代價；侵犯。常用復數：
例句：
Foreign products have made inroads into the American economy.
進口產品侵害了美國經濟

來源：
in
in
road [riding, raid (obsolete)]
road[騎，襲擊（廢語）]