OB
out of bounds, off the golf course premises (usually marked with white stakes or property fences) (also "O.B., out of bounds, Oscar Brown")
Off the deck
from the fairway or ground (mainly used in reference to hitting a driver off the ground rather than on a tee)
Offset
a clubhead where the leading edge is set back from the shaft
On the screws
hitting it on the sweetspot, usually of a wood, or driver in particular (many woods originally had an insert in the center of the face that was attached with screws, thus the expression)
One-piece takeaway
when the beginning of the backswing is initiated by the torso, arms and hands moving together as one unit or in one piece
One-putt
when only one putt is taken on a green to hole the ball
Open
1. a tournament in which any eligible competitor can play, if they qualify 2. ("open clubface, open stance") refers to the alignment of the body/stance or clubface - for a right-handed player the stance would be open if the body were aligned to the left of the target and an open clubface would be aimed to the right of the target
Oscar Brown
another phrase for out of bounds
Out
The first nine holes of an 18 hole course, comes from Links courses (also "front, front nine, front side, first nine")
Out of bounds
area that is not part of the course, on which play is not permitted (usually marked by white stakes or property fences) -- see also "provisional ball" (also "out of play, ob, Oscar Brown")
Outside
on the opposite side of the target line from the golfer 2. (also "away") farther from the hole than
Outside-in
a swing path that cuts across the target line from the far side of the target line, in relation to the player (outside), to the near side (inside) through the impact area
Overall weight
the total weight of a golf club (see "swingweight") (also; "dead weight, static weight")
Overlapping grip
(also "overlap" and "Vardon grip" after famous player, Harry Vardon) the most common grip in golf, placing the hands on the club such that the pinky finger of the bottom hand rests on the index finger of the top hand, or between the index and middle fingers of the top hand
Overseed
to plant new grass seed directly into already existing turf, often used in off season/winter conditions when primary grass goes domant
Overswing
1. to swing too hard to the point of negatively affecting the result 2. too long a backswing, usually thought of in terms of well beyond the point of the club's shaft being horizontal or parallel with the ground at the end of the backswing
Over the top
a downswing path or plane above, or over, the correct or desired plane, causing the path of the club through impact to be across from outside to inside the target line (also "coming over the top")