cop-killer

noun — 2 senses

noun

Etymology From cop + killer.

A person who deliberately kills an on-duty police officer.

Serpico spat the words out. "For killing a cop! He's a fucking cop-killer! Tell that to all his fucking friends up there."1974, Peter Maas, “Chapter Thirteen”, in Serpico, Bantam edition, New York: Bantam Books, published 1973, →ISBN, page 225:

noun

Etymology From the bullet's (bullets') supposed ability to penetrate body armor, thus endangering police officers.

US, Slang A Teflon-coated bullet.

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.