I have heard many times people say the Big Apple to mean New York City.
What is the origin of this nickname?
Wikipedia offers some interesting reading on the subject, but my understanding is that nobody still knows for sure.
Apples are commonly grown in New York State. It is the state fruit and a major export.
So, Big Apple would compare the city to upstate. Imagine a map with the cities marked as apples.
This question is protected to prevent "thanks!", "me too!", or spam answers by new users. To answer it, you must have earned at least 10 reputation on this site.