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Kamikaze Notrump
A Japanese Notrump treatment, which, when employed, causes your monthly IMP average to spiral downwards and evenually crash.

Kibitzer (n.)
An infallible bidder, declarer and defender who never participates in an auction and never plays a card.

Kickback (n.)
1. A way of further complicating the ace asking process to the point where it pays just to punt slams.

2. The response one gets from alerting (See: Alert) your partner to a new-fangled bid you just added to your system by extending your foot so that it brutishly comes into contact with her shin.

King (n.)
Declarer's sure trick when partner has the ace. (See: Ace)

Knave (n.)
Various hypotheses have been presented as to what this card is worth, but with no resolution. Many agree that the knave often gets depressed and sticks a sword through its head, unless paired with a neighboring spot.