2
                           general:: 
                            Phrase(s): go off half-cocked 
Fig. to go into action too early or without thinking. (Originally refers to a flintlock or matchlock gun firing prematurely, before the trigger was pulled.)  •  Don’t go off half-cocked. Plan out what you’re going to do.  •  Bill went off half-cocked and told everybody he was running for the state legislature.
                        
                        
 
                        
                            McGrawhill's American Idioms And Phrasal Verbs