The action of the ball when struck low and/or with a high-lofted club.
                                                            
                                                     
                        
                                                
                        
                        
                            spin of a ball that goes forward under of the ball, causing the ball to float and bounce lower
                                                            
                                                     
                        
                                                
                        
                        
                            spin of a ball that goes forward; the spin is underneath the ball, causing the ball to float and bounce lower