When the ball lies above or below your feet.
                                                            
                                                     
                        
                                                
                        
                        
                            As the name suggests, the ball is positioned on a slope which runs roughly parallel to the direction of play.
                                                            
                                                     
                        
                                                
                        
                        
                            lie in which the ball is on a hillside and is therefore either above or below the golfer's feet.