The phrase "major inroads" refers to significant progress or success achieved in a particular area or field. It implies making significant advancements or gaining considerable influence or success. Full definition
The East African man's genome, the first map of ancient human DNA from Africa, helped to determine that a population closely related to Europe's first farmers made major inroads in Africa, the researchers report online October 8 in Science. (sciencenews.org)
The Ukip leader will attempt to ensure the party's conference in Doncaster comes to a close with a bang by setting out research that outlines how it is making major inroads in Labour's heartlands. (itv.com)
Groupon Chief Executive Officer Andrew Mason said last week that Yelp hadn't made major inroads into its business. (bloomberg.com)