Definition of up card in English:

up card

noun

US
  • A playing card turned face up on the table, especially the top card of the waste heap in rummy or a card turned face up in stud poker.

    • ‘The rules of Texas Hold'em, for example, could be changed to have a round of betting after the first down card and after each individual up card.’
    • ‘Turn up another card for a different dealer's up card.’
    • ‘There is betting after each card is dealt, starting with the first up card.’