Re:The Birth of New Spain
by alistairSH on Tuesday July 21, 2020 @07:16PM
(#23911948)
It was actually used on Roman soldiers for capital offenses (cowardice, rebellion/treason, etc). The cohort being punished would be divided into groups of 10, then draw lots. The "lucky" 9 were then expected to kill the 10th.
It's now used when you mean that a sizeable part of a population dies, not necessarily one tenth, but it's interesting to remember the origin of the expression.