Definition: In English, "exch" means to exchange or trade something for another thing. The word can be used as a noun (as in "exchange") or verb (as in "to exchange"). Example usage: 1. He exchanges his books for some money. 2. They exchanged their clothes for new ones. 3. The manager exchanged his company's stock for new shares. Please note that the specific meanings may vary depending on the context in which they are used.