If you’re dressed to kill, you’re looking sharp. But does the expression have to do with medieval chivalry or military armor of any kind? Nope. The earliest cases pop up in text in the 1800s, based on the trend of adding the words to kill onto verbs...
KKN n.— «Could the kkn (korupsi, kolusi dan nepotisme) plague thrive in HDB-land after all?» —“Harry Lee, is there Corruption involved in the small arms industry?” by Andrei (andreid@sprint.ca) Usenet: soc.culture.singapore Mar. 17, 1998. (source:...

