throw/fling/cast caution to the wind
idiom
                                
              
          
                                                      : to stop being careful and do something that is dangerous or that might result in failure                                      
              
                             
After thinking about it for years, he finally threw/flung/cast caution to the wind, quit his job, and started his own company.
                         
                
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  Merriam-Webster unabridged




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