Sense file
How the sense moved
The archive follows the dated record first, then reads the social or rhetorical pressure that hardened, softened, narrowed, or reversed the word.
Older meaning
A physical wall intended to prevent the spread of fire in a structure.
Modern meaning
A digital barrier that blocks or filters unwanted network traffic.
Research lens
The metaphor is powerful because it imports emergency architecture into routine network defense and makes filtering feel like firebreak management.
Meaning trail
Older use
fire-stopping wall
The material barrier came first.
Bridge
protective boundary
The containment logic was easy to abstract.
Now
network defense layer
Security software inherited the defensive wall.