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- Open face
- When (in relation to the target line) the club-face is angled away from the player's body, ie angled right for right-handed players.
- Open stance
- When a player's front foot is drawn backwards further from the target line. Used to fade the ball or to prevent a hook.
- Ostrich
- The single hole score of -5, or five under par. The only way this can occur is with a hole-in-one on a par 6, or two on a par 7. This score has never been achieved and it is unlikely that it ever will considering the dramatic length and rarity of holes over par 5. See Par (score).
- Outside agent
- Is any agent not part of the match or, in stroke play, not part of the competitor's side. Referees, markers, observers, and fore-caddies are outside agents. Wind and water are not outside agents.
- Outward nine
- Refers to the first nine holes, so named as links golf courses were set up where the first nine holes went "out" away from the clubhouse.
- Out-of-bounds
- The area designated as being outside the boundaries of the course. When a shot lands "O.B.", the player "loses stroke and distance", meaning that he/she must hit another shot from the original spot and is assessed a one-stroke penalty. Out-of-bounds areas are usually indicated by white posts.
- Overlapping grip
- See Vardon grip
Read more about this topic: Golf Terminology