Main suit a bidder's or a declarer's longest suit, especially one that will be used as a primary source of tricks. Major penalty card a card prematurely exposed deliberately, or any honor prematurely exposed.
Major suit spades or hearts.
Make up join a game so as to complete a foursome. Marked of known location. Marked finesse a finesse against a marked card. Masterpoint a unit of measurement of achievement in tournament play. Maximal overcall double the double of a maximal overcall, or the raise of a maximal overcall, as a game invitation.