1. noun A police officer or federal agent, especially one working undercover, specializing in narcotics and related crimes. Word moved around town that I was a narc, and most people suddenly started refusing to talk to me. The place is going to be be crawling with narcs, so we can't move the product through here.

2. noun Someone who acts as an informer or spy for an authority figure, especially law enforcement. An alternate spelling of "nark," likely due to the influence of definition 1. The FBI offered to let me avoid jail time if I agreed to be a narc for them. I can't believe you told Mom and Dad! Why do you have to be such a narc?

3. verb To act as an informer or spy for an authority figure. An alternate spelling of "nark," likely due to the influence of definition 1. It turned out that she had been narcing on the cartel for years. Don't narc on them, Tommy—no one likes a snitch!

1. A police officer or federal agent specializing in narcotics and related crimes. Don't let anyone find out you're a narco down here, or you'll be as good as dead. The place is going to be crawling with narcos, so we can't move the product through here.

2. Someone controls the supply and distribution of narcotics, especially in Latin America. In this country, the politicians and the narcos shape control the law in equal measure. One of the leading narcos in the world was finally arrested by police.

3. Narcotics in general. The trafficking of narco in this region has gotten progressively worse over the years. The university kicked him out after a huge stash of narco was discovered in his dorm room.

1. noun Someone who acts as an informer or spy for an authority figure, especially law enforcement. The FBI offered to let me avoid jail time if I agreed to be a nark for them. I can't believe you told Mom and Dad! Why do you have to be such a nark?

2. verb To act as an informer or spy for an authority figure. It turned out that she had been narking on the cartel for years. Don't nark on them, Tommy—no one likes a snitch!