To unfasten, as what is locked; as, to unlock a door or a chest.
                                                            
                                                     
                        
                                                
                        
                        
                            (1) To allow a relocatable block to be moved during heap compaction. (2) To allow a previously locked range of pages to be paged out. (3) To free a previously locked object in the QuickDraw GX heap so that it can be moved See also: lock
                                                            
                                                     
                        
                                                
                        
                        
                            open the lock of; "unlock the door"