n.[(+into/on/upon)]

1. 侵袭；侵入[C]
   make inroads into a country

   侵袭某个国家

2. 侵害；侵占；侵蚀[P]
   inroads on the domestic market

   对国内市场的侵蚀

n.

1. an instance of something being encroached on or reduced:
   the firm is making inroads into the UK market.
2. a hostile attack.