the.com/casing

the unsung shell that takes the hit so the precious insides don't have to

means The outer protective covering or shell of something — like the skin around a sausage, the frame around a doorway, or the housing that encloses a mechanism.

from From "case" plus the noun-forming "-ing." "Case" in this sense comes from Old French "casse" (a box or container), itself from Latin "capsa," a chest or holder — the same root that gives us "capsule." So a casing is literally a little box grown into a verb-shaped noun: the thing that does the enclosing.

sausage origin
Originally cleaned animal intestines stuffed with meat
oil drilling
Steel pipe lining wells to stop collapse
bullet remains
The empty shell ejected after firing
casing crew
Detectives reading window peeks call it casing the joint
for instance

casa loma — gothic revival castle in toronto built 1911-1914 with 98 rooms

hearst castle — san simeon mansion in california with 250 rooms built 1919-1947

biltmore estate — vanderbilt mansion in asheville, north carolina with 254 rooms completed 1895

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