hard core
noun /ˌhɑːd ˈkɔː(r)/
/ˌhɑːrd ˈkɔːr/
[singular + singular or plural verb]- the small central group in an organization, or in a particular group of people, who are the most active or who will not change their beliefs or behaviour
- It’s really only the hard core that bother(s) to go to meetings.
- A hard core of drivers ignore(s) the law.
- A hard core of supporters, mostly teenage girls, gathered at the airport to see the star arrive.