peacenik

[ pees-nik ]
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nounSlang: Often Disparaging.
  1. an activist or demonstrator who opposes war and military intervention; pacifist.

Origin of peacenik

1
An Americanism dating back to 1960–65; peace + -nik

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

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