Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Being an enrolled member of a particular organization: a card-carrying Communist.
  • adj. Avidly devoted to a group or cause: card-carrying fitness enthusiasts.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. 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.
  • adj. Loyal and dedicated to some cause.

Etymologies

From the assumption that such a person carries a membership card.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

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