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Region: General | Usage example: Installing security after the data leak felt like locking the barn door.

Lock the barn door

Meaning

Take action after the damage has already been done.

Usage

Used to warn against late responses to preventable disasters.

Origin & History

Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.

Farmers realized locks were useless after animals had escaped.

Appears in 19th-century farming manuals and cautionary tales.

Related Idioms

Lock the door

Ensure finality and security.

Lock horns

Enter into conflict.

Beating a path to your door

Attracting a lot of interest or visitors.

More Idioms

Break the ice

To do or say something to relieve tension or get conversation going in a social situation.

Cut to the chase

Skip ahead to the most important or exciting part of something.

The ball is in your court

It is now your turn to take action or make a decision.

Throw in the towel

To concede defeat or admit a struggle isn't worth continuing.