noun

deadbolt

deadbolt

He installed a deadbolt for extra security.

He installed a deadbolt for extra security.

Don't forget to turn the deadbolt before you leave.

Don't forget to turn the deadbolt before you leave.

((a/the)) deadbolt ((on sth.)) a deadbolt on a door The deadbolt on the front door is broken.

latch, lock

From 'dead' (immovable, not spring-loaded) + 'bolt' (a sliding bar). It's a bolt that cannot be moved except by turning a key.

Picture a bolt that is 'dead' or unmoving, making the door very secure. It doesn't move on its own like a spring latch.

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