second method is to play free association with words and phrases. Free association is when you hear a word, then you come up with another word that the first word makes you think of. The second word can be anything, and the goal is to do this instantaneously.
For example, cat:dog, dog:puppy, puppy:paws, paws:fur, fur:allergies, allergies:medicine, medicine:nurses, nurses:doctors, doctors:plastic surgeon, plastic surgeon:fake lips, and so on. That was a free association word chain that began simply with the word cat.
How do you train this? Pick a word at random from a dictionary, and list out fifteen words in a free association word chain as quickly as possible. Then, do it again and again – verbally, because that will require the quickest thinking.