A thin rod — two old clubs do the same job — laid on the ground to check your target line against your foot line. The fastest cure there is for crooked shots.
Score names relative to a hole's par: a birdie is one under par, a bogey one over, an eagle two under. Golf almost never states a score in absolute strokes.
The strip of turf your iron lifts out of the fairway on a strike. Replacing it, or filling the scar with sand, is the core piece of course-care etiquette.
The group you play a round with. In German golf this one word carries everything: tee time, pace of play, etiquette — and your most reliable practice partner.
The three ways your hands connect on the club: overlap (little finger resting on top), interlock (fingers hooked together) and the ten-finger or baseball grip.
General
Terms from training theory that apply in every sport.
BMR is your basal metabolic rate at complete rest; TDEE is total daily expenditure including everyday movement and training. Nutrition targets always work off TDEE.