The term 'Sudden Drop' can be described as a 'NOSEDIVE, ' which is an 8-letter word. A NOSEDIVE is a sudden, steep decline or drop in something, such as a stock market index or a company's profits. It is often used to describe a rapid and unexpected decrease in the value of a stock or other financial instrument. The term can also be used to describe a sudden and dramatic decrease in the popularity of a product or service.