1. [mid-19C+] a police informer.
2. (UK Und.) a pickpocket’s assistant, who distracts the victim and keeps a look-out.
3. a miser.
4. [mid-19C+] (mainly Aus./N.Z., also narker) an irritating person, a spoilsport, a badly behaved person.
5. [late 19C+] a police officer.
6. [late 19C+] (mainly Aus.) spite, rancour, umbrage; a grudge.
7. [1910s+] any annoying or disagreeable situation.
8. [1920s–30s] (UK tramp) a beggar who works part-time and lives permanently in a common lodging house, thus having a privileged relationship with the owner.
9. [1910s+] one who reports to the authorities, a telltale.
10. [1960s] an agent, a go-between.
11. see narc n. (2)
[20C+] (Aus.) to become angry.
[20C+] (Aus.) of individuals, to anger, to annoy; of objects to ruin to put out of order.
[1900s] (Aus.) to dislike.