dead ball: A ball barely off of the hole, making the next putt an absolute certainty.
default: Concede a match without playing it.
divot: A slice of turf lifted by a club during a stroke. Golfing etiquette requires it must be replaced and pressed down.
dormie: In match play, describes the situation in which a team can't lose a match against the competition because the number of holes remaining is the same as the current lead. To go “dormie,” means the player can't lose the match (at least in regulation).
down: The number of holes (in match play) or strokes (in medal play) a player is behind, as in “three down.”
draw: A controlled and (slight) hook on the flight of the ball. Usually a draw rolls farther than a fade.
dub: A gentler term for a hacker; also to hit the ball poorly.