Idioms
go off half-cocked (informal)
to start before preparations are complete, so that the effect or result is not as it should be 沒準備好就開始幹，操之過急（因而效果或結果不好） You've got to promise you won't go off half-cocked and do something rash. 你必須保證不會草率行事，做出魯莽的事情。