bring a knife to a gunfight

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bring a knife to a gunfight

To come poorly prepared or equipped for some task, goal, competition, or confrontation. Often used in the negative as a forewarning or piece of advice. Make sure you have researched your position thoroughly and comprehensively before the debate. You don't want to bring a knife to a gunfight. If you haven't studied law, representing yourself in court is like bringing a knife to a gunfight.
See also: bring, knife