As a noun nark
is (british|slang) a police spy or informer or nark
can be (narcotics officer
As a verb nark
is (slang) to serve or behave as a spy or informer.
As an interjection zark is
Other Comparisons: What's the difference?
From (etyl) nak.
(British, slang) A police spy or informer.
* 1912 , , Act I,
- It’s a—well, it’s a copper’s nark , as you might say. What else would you call it? A sort of informer.
(slang) To serve or behave as a spy or informer.
(slang) To annoy or irritate.
(slang) To complain.
- It really narks me when people smoke in restaurants.
(transitive, slang, often imperative) To stop.
- He narks in my ear all day, moaning about his problems.
- Nark it! I hear someone coming!
* Oxford English Dictionary , 2nd ed., 1989.
* zark off