foothill
noun
                                                                                                                            
                                                            foot·hill
                    
                                                                                                              
                                                                                                                                  ˈfu̇t-ˌhil  
                                                      
                                                          
            1
                    
                                          
              
          
                                                      : a hill at the foot of higher hills                                      
                
                    
2
                    
                                foothills  plural                                  
              
          
                                                      : a hilly region at the base of a mountain range                                      
                
                    
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  Merriam-Webster unabridged




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