dead flat ( synonym found)
Definition of dead flat:

(n) : the part of the lock which is moved when the key is engaged; a kind of lock in which the bolt (moving portion) is held in position by th cylinder rather than by a spring and so can not be retracted except by turning the cylinder
Definition of dead flat:

(n) : the part of the lock which is moved when the key is engaged; a kind of lock in which the bolt (moving portion) is held in position by th cylinder rather than by a spring and so can not be retracted except by turning the cylinder
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