amok

English borrowed "amok" from Portuguese amouco, which came from Malay amuk, meaning "to go on a killing spree." It entered English in the 16th century through accounts of the people of Malaysia and Java, first appearing in Duarte Barbosa's 1516 text as translated by Henry E. J. Stanley.

The word kept its violent, frenzied core as it moved from Malay through Portuguese into English, where it's still used to describe someone acting in a wild, uncontrolled rush.

Interestingly, there's a separate, unrelated word spelled the same way in Khmer — អាម៉ុក (ʼaamok) — which simply means "to steam in banana leaves," a reminder that identical spellings don't always share a family tree.