Valsalva maneuver
noun
                                                                                                                            
                                                            Val·sal·va maneuver
                    
                                                                                                              
                                                                                                                                  val-ˈsal-və- 
                                                      
                                                          
            
                                
              
          
                                                      : a forceful attempt at expiration when the airway is closed at some point                                      
                
                                
            especially                
          
                                                      : a conscious attempt made while holding the nostrils closed and keeping the mouth shut (as for the purpose of adjusting middle ear pressure)                                       
                
            called also Valsalva
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  Merriam-Webster unabridged




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