flash point
noun
1
                    
                                          
              
          
                                                      : the lowest temperature at which vapors above a volatile combustible substance ignite in air when exposed to flame                                      
                
                    
2
                    
                                          
              
          
                                                      : a point at which someone or something bursts suddenly into action or being                                      
                
                    
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  Merriam-Webster unabridged




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