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  1. a lock bolt that is moved into position by the turning of a knob or key rather than by spring action.
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Origin of deadbolt

Also called deadlock.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for deadbolt

Historical Examples

  • She closed the blinds quickly, then went to the door and shot the chain and the deadbolt closed.

    Someone Comes to Town, Someone Leaves Town

    Cory Doctorow