GUR

Ground Under Repair (GUR)
An area of a golf course that is being repaired. If a ball lands in an area marked ?GUR?, they must remove the ball and drop without penalty.
MyGolfRounds.com Golfing Terms Glossary ...

Ground Under Repair (GUR)
An area of the golf course that is being repaired. A free drop is allowed if the ball lands in an area marked "GUR."
Groove
the crevices on the face of a club that are designed to impart spin on the ball.
Golden Ferret ...

ground under repair (GUR) A marked area (usually by paint, chalk, or roping) on the course from which a player may move her ball one club length without penalty, prior to playing her next shot.

Ground Under Repair (GUR): An area of the golf course that is being repaired.
Hazard: Physical part of the course such as water traps or sand, bunkers and hills where it is very hard to play the ball.

Ground under Repair (GUR)
If an area of the couse is under maintenance and your ball lands there, you can remove your ball without penalty. Normally identified by stakes or a line.
H ...

If a lifted ball is to be replaced, its position must be marked. If a ball is to be dropped or placed in any other position (e.g. taking relief from GUR, etc.) it is recommended that the ball's original position be marked.

See also: Ground Under Repair, Penalty, Golf, Penal, Round