deadbolt
verbEtymology From dead + bolt.
1
To fasten or secure with a deadbolt.
deadbolt
nounUS /ˈdɛdˌboʊ̯lt/
Etymology From dead + bolt.
1
The part of the lock which is moved when the key is engaged.
2
A kind of lock in which the bolt (moving portion) is held in position by the cylinder rather than by a spring and so cannot be retracted except by turning the cylinder.