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Re:Amazon reaches agreement with trade unions in Italy by swarnie on Friday September 17, 2021 @02:47AM (#28562061)
None of the 11 definitions offered by google mention the murder of people, maybe your confused?

The closest answer is the 3rd:

put down

phrasal verb of put

3) suppress a rebellion, coup, or riot by force. "the security forces put down a coup attempt in the capital"

Re:Amazon reaches agreement with trade unions in Italy by throwaway525142 on Friday September 17, 2021 @09:03AM (#28564985)
https://en.wiktionary.org/w/index.php?title=put_down&oldid=6...

4th definition: (euphemistic) To euthanize (an animal).

I'd say it's not out of question that this could be applied to people as well.