When it comes to sending something back, there are many different words and phrases you can use. For example, you might use the word "return" if you are sending a product back to a store because it is defective or doesn't fit. Similarly, you might use the phrase "exchange for" if you are returning one item and asking for a different one. Other synonyms for "sends back" might include "send in", "remit", "ship back", "dispatch", or even "relegate". Whatever word or phrase you choose, it is important to be clear and concise in your communication to ensure that your message is received and understood by the intended recipient.