The phrase "biggest competitor" refers to another person, company, or entity that poses the greatest challenge or competition in a particular field or industry.
Here's how they keep their edge against bigger competitors in branding, networking, technology, and retaining support staff. (realtormag.realtor.org)
Of course, conventional wisdom tells us that independent pet retailers must set themselves apart in order to effectively compete with bigger competitors down the street, but what exactly should this entail? (petbusiness.com)
We use that term to explain what happens when bigger competitors announce products and get you to wait on your purchase. (scobleizer.blog)