1964, in the meaning defined at transitive sense
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The Words of the Week - 1/10/20
Some of the words that defined the week of January 10, 2020
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“De-escalate.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/de-escalate. Accessed 19 Aug. 2022.
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