The phrase "lush jungle" is an adjective used to describe a dense, green and vibrant forest filled with lush vegetation. The word "jungle" refers to a wild, undeveloped area of land while the term "lush" describes something that is luxuriant or flourishing with growth. Therefore, when put together, the phrase "lush jungle" conveys an image of a dense forest teeming with luscious greenery and thriving plant life.