trip wire
noun
1
                    
                                          
              
          
                                                      : a low-placed concealed wire used especially in warfare to trip an enemy or trespasser and usually to trigger an alarm or explosive device when moved                                      
                
                    
2
                    
                                          
              
          
                                                      : something (such as a small military force) intended to function like a trip wire (as to set a larger military force in motion)                                      
                
                    
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  Merriam-Webster unabridged




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