1. barn door - Noun
2. barn door - Verb
the large sliding door of a barn
Source: WordNetbarn-door
I see this fella built like a barn door... and there's all these fox hunters, who didn't like me, screaming and shouting and as I walked past him I looked at him and he hit me with something. John Prescott
He was a devout believer in the second chance. To the man who asked, "What's the point of closing the barn door after the horse has been stolen?” Murray would answer, "The point is that the door is now closed.”. James K. Morrow
Don't close the barn door after the horse runs away. American Proverb
Don't shut the barn door after the horse is stolen. French Proverb
There's no use in closing the barn door after the horse is stolen. American Proverb
At the end of the day, we may find the whole world closed the barn door after the horse got loose. Source: Internet