the.com/massacre

The mass killing of people who had little or no ability to defend themselves.

means The deliberate, indiscriminate killing of a large number of people who have little or no ability to defend themselves.

from From French massacre, likely tracing back to a Germanic root meaning butcher's block or slaughterhouse — a word originally about carcasses before it became a word about corpses. It entered English in the 1500s already carrying its full horror, used for the wholesale slaughter of people rather than livestock.

etymology
French for butcher's chopping block
key distinction
implies victims couldn't fight back
loaded word
one side's battle is another's massacre
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