The phrase "to train a cat" means teaching a cat how to do certain behaviors or follow commands through repetition and positive reinforcement. Full definition
If you must pill or administer liquid medication, consider clicker training your cat to accept the process or work on developing a quick, calm method of administering medication with minimal stress. (catbehaviorassociates.com)
He said that he didn't train the cats at all, he simply figured out what each cat liked to do best and then encouraged that behavior! (rismedia.com)
But folks, there are ways of training a cat not to do those things without putting a cat shock collar on her. (best-cat-art.com)