The phrase 'sends through the roof' implies an intense increase, such as in prices, emotions or energy levels. Therefore, antonyms would be words that mean the opposite, indicating a decrease or a lack of change. Some antonyms for 'sends through the roof' could include 'brings down,' 'lowers,' 'deflates,' 'reduces,' or 'plummets.' These words indicate a decrease or a decline in the intensity rather than a surge. It is important to know antonyms to help communicate the desired message and avoid confusion. So, depending on the context, using antonyms can help make the meaning of a statement clearer.