Meaning

noun someone who tries to bring peace

noun a belt-fed machine gun capable of firing more than 500 rounds per minute; used by United States troops in World War II and the Korean War

originCompound of peace + maker. First attested in the Tyndale Bible from 1526, as a translation of Koine Greek εἰρηνοποιοί (eirēnopoioí, “peacemaker”), a hapax legomenon found in the New Testament. (The Wycliffe Bible from 1395 instead uses "pesible men", to translate Latin pacifici from the Vulgate)

Etymology from Wiktionary, CC BY-SA 3.0