the.com/deadbolt
The lock that means it, sliding home with no spring to second-guess.
means A lock with a solid bolt thrown by a key or knob, immune to being pushed back like spring latches.
from From dead, meaning fixed and inert, plus bolt: a bolt that stays put with no springy retreat, hence dead to force.
No springCannot be slipped with a credit card.
Throw lengthOne-inch bolts resist kick-ins far better.
Double cylinderKeyed both sides, banned near glass doors.