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Flyer lie - refers to a ball that usually is sitting in the rough with a small patch of grass sitting behind it. Upon contact the ball is actually launched further then intended due to the grass being between the ball and club face at impact.
Just as there is grass behind the ball there usually is no grass in front allow for the ball to 'fly' from its position in the rough. This ball is usually devoid of spin

G.U.R. - an acronym for Ground under repair. If your ball comes to rest in one of these areas, usually marked off with white paint. You may take full relief free drop (with out penalty) one club length no closer to the hole.

Edit: did not see the above two post