LEARNit Dictionary
hard core
noun
/ˌhɑːd ˈkɔː(r)/
UK
/ˌhɑːrd ˈkɔːr/
US
1
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
هستهٔ سخت, هسته مرکزی, هسته اصلی