Keep it inside the hole
an instruction to aim the putter and/or stroke the ball inside the edge of the cup (also "don't give the hole away")
Kick
1. bounce (implies direction) of the ball upon landing 2. the springing back of a flexed shaft
Kick point
the point of maximum bending of a club's shaft, measured with the club in a horizontal position by securing the grip end of the club and hanging a standardized weight just above the club head (also "flex point")
Kikuyu grass
very durable, creeping, wiry grass, originally from Africa, often used in warm, dry regions (also just "Kikuyu")
Kitty litter
another term for a sand-filled bunker
Knee knocker
a short putt that, for whatever reason, is challenging (not a gimme) (also "tester")
Knife
another term for a one iron
Knockdown
a shot played with less than a full swing, mainly to control distance, trajectory and spin (also "knockdown shot, punch, punch shot, half shot")