A sudden reversal is a term used to describe a dramatic change in direction or opinion. It is often referred to as a 'switcheroo, ' which is a 10-letter word that can be found in crosswords. A sudden reversal can refer to a variety of situations, such as a political leader changing their stance on an issue or a company making a drastic decision. In any case, it is a sudden and unexpected change that can have far-reaching consequences.