Definition from Wiktionary, the free dictionary
- Enrolled as a member of an organization, and having a card to prove it; used especially to signify loyal dedication to that organization or the cause it supports.
- (by extension) Loyal and dedicated to some cause.
- 2004 Peter Mommsen - Homage to a Broken Man: The Life of J. Heinrich Arnold
- Except for the men in uniform, few in the hail were card-carrying Nazis. But they must have long shared a silent approval of Hitler's goals.