Meaning: This means that when people work together as a team, they are more likely to achieve their goals than when they work alone.
Choice of Words: The word "teamwork" means the combined effort of a group of people working together. "Makes" means to cause something to happen or to exist. "Dream" means a goal or ambition. "Work" means to do something in order to achieve a goal. When you put them together, the sentence means that when people work together as a team, they can achieve their goals and make their dreams come true.