The phrase "countless doors" means that there are so many possibilities or opportunities available, it is impossible to accurately count or measure them. Full definition
It opens countless doors for educating our community, and that is what we are most excited for.» (blog.kitchenaid.com)
«Expanding the number of land banks throughout the state provides a boost for struggling urban communities, empowers municipalities and opens countless doors for community revitalization and economic development,» Silver said. (thebronxchronicle.com)
Supporters like YOU made over 12,000 phone calls to voters, contacted another 6,000 Planned Parenthood supporters, and knocked on countless doors (plannedparenthoodvotes.org)