sally port
noun
1
                    
                                          
              
          
                                                      : a gate or passage in a fortified place for use by troops making a sortie                                      
                
                    
2
                    
                                          
              
          
                                                      : a secure entryway (as at a prison) that consists of a series of doors or gates                                      
                
                    
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  Merriam-Webster unabridged




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