1. significant progress or advancement into a new area or market
Usage: usually plural
2. encroachment or invasion that reduces or weakens something
Usage: usually plural

Examples

• The company made significant inroads into the European market.
• Social media has made inroads into traditional advertising.
• The new technology is making inroads in the healthcare industry.
• Urban development has made inroads into the forest preserve.
• The disease made serious inroads into the population.
• Foreign competitors have made inroads into our customer base.
• The startup is making inroads against established companies.