配合 (pèi hé) means to cooperate or coordinate with someone, or for parts to fit together and work in harmony. It focuses on the action of working together effectively, unlike 搭档 (dā dàng) which emphasizes being a partner, or 协同 (xié tóng) which is more formal and often used in organizational contexts. For matching items like colors or food, use 搭配 (dā pèi) instead.