(chess) A checkmate pattern in which a bishop "suffocates" the enemy king (by taking away its flight squares), while a knight delivers checkmate.

(chess) A checkmate pattern in which a queen, supported by a piece of its same color, is placed diagonally adjacent to the enemy king. The two flight squares that the queen does not control are occupied by pieces of the king's own color.

(nautical) In the merchant navy, the officer who is second in command to the captain, and whose primary duties include managing the maintenance and upkeep of the vessel.

(chess) A checkmate, delivered by a knight, in which the mated king is unable to move because he is surrounded (or smothered) by his own pieces.

Someone with whom one lives or works on a farm.

Someone with whom one shares a plane ride, especially a seatmate.

Someone with whom one rides in a train.

(chess) The quickest possible checkmate in the game of chess.

(politics) A candidate on a joint ticket. / (politics) A candidate for the US vice-presidency. / One of a pair of ships with coordinated, often reciprocal, sailing schedules.

(nautical) An officer on a merchant ship next in rank to the captain and responsible to the captain for the safety and security of the ship.