the.com/deadlatch
a latch that grew a spine and stopped taking bribes from credit cards.
means a spring-latch door lock upgraded with a secondary mechanism that blocks the bolt from being pushed back, so it can't be shimmed open with a card or knife.
from from 'dead' meaning fixed/immovable (as in deadbolt) plus 'latch'; developed to fix the classic weakness of spring latches, which any determined teenager with a library card could defeat.
vs deadboltdeadlatch auto-locks on close, deadbolt needs a key turn
the flaw fixedstops the credit-card slip-open trick cold
common homestandard on most modern entry door handlesets