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Gunfight
Example
If you think you can win this argument with just your opinion, you're bringing a knife to a gunfight.
If you don't prepare thoroughly for the job interview, you'll be bringing a knife to a gunfight and won't stand a chance against the other candidates.
They have been bringing a knife to a gunfight for years, refusing to adapt to new technologies and falling behind their competitors.
By the time he realized his mistake, he had already brought a knife to a gunfight and lost the opportunity to make a good impression.