WordReference Random House Unabridged Dictionary of American English © 2026
side′ card′, [Cards.]
- [Poker.]the highest card in a hand that is not part of a scoring combination, as not being one of a pair, three of a kind, etc., and that serves to determine by its denomination the higher ranking of two otherwise equal hands.
- a card other than a trump;
plain card.
- 1855–60, American.