Doubtful Card.—Cards which may or may not win the trick. The king is led, and you do not know who holds the ace; the king is therefore a doubtful card.
Dummy.—The player whose cards are exposed on the table. The dealer's partner.
Duplicate.—A modification in which each hand is played more than once, usually in tournaments.
Echo.—Playing a higher card before a lower, when no attempt is made to win the trick.
Eldest Hand.—The player on the dealer's left.
Established Suit.—A suit in which the partners can win every trick, no matter who leads it.
Exposed Card.—Any card which is shown, but is not played to the trick, such as two cards played at once, one of which is an exposed card.
False Cards.—Playing the ace, holding the king, or any similar attempt to conceal the cards held.
Finesse.—Any attempt to win a trick with a card which is not the best in the hand, nor in sequence with it.
Forcing.—Making a player trump a suit which he does not want to trump. See Ruffing.