Amok
wiktionary
From Portuguese amouco, from Malay amuk(“to go on a killing spree”). The term first appeared in English around the 16th century, associated with the people of Malaysia and Java, first described in the 1516 text The Book of Duarte Barbosa, which was translated to English by Stanley.
etymonline
amok (adv.)
in run amok a verbal phrase first recorded 1670s, from Malay (Austronesian) amuk "attacking furiously." Earlier the word was used as a noun or adjective meaning "a frenzied Malay," originally in the Portuguese form amouco or amuco.
There are some of them [Javanese] who ... go out into the streets, and kill as many persons as they meet. ... These are called Amuco. ["The Book of Duarte Barbosa: An Account of the Countries Bordering on the Indian Ocean and Their Inhabitants," c. 1516, English translation]
Compare amuck.
