ground rule
noun
1
                    
                                          
              
          
                                                      : a sports rule adopted to modify play on a particular field, court, or course                                      
                
                    
2
                    
                                          
              
          
                                                      : a rule of procedure                                      
              
                             
ground rules for selecting a superintendent— Amer. School Board Jour.
Amer. School Board Jour.
                         
                
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