American Idioms – Idiom Wizard Lists Over 5,500 Idioms & Slang Descriptions

Lock the barn door after the horse gets out


(Old fashioned) Useless and stupid endeavor. Obviously, if the horse has escaped the barn, then locking the door is a useless reaction and of no value, so this phrase is used to describe any fruitless actions to curb a problem. (Compare to For naught.)

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