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Region: General | Usage example: We locked the door on the contract terms.

Lock the door

Meaning

Ensure finality and security.

Usage

Used when confirming an irreversible situation.

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.

Securing entryway with a lock.

Used literally then metaphorically for finality.

Related Idioms

Lock the barn door

Take action after the damage has already been done.

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.