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In some senses, cop-killer is marked as slang, US. Watch for register when choosing this word.
cop-killer
noun 2
Definitions
noun
1
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."
noun
1
A Teflon-coated bullet.
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