I already did.
The modern day definition:
kill, destroy, or remove a large percentage or part of.
"the project would decimate the fragile wetland wilderness"
The historical definition:
2.
HISTORICAL
kill one in every ten of (a group of soldiers or others) as a punishment for the whole group.
"the man who is to determine whether it be necessary to decimate a large body of mutineers"
'nuff said!
I have told you this before. But you lost that discussion so you in the retelling you are lying.