The term 'Sudden Jump' can be described as a sudden, unexpected LEAP or movement. It is often used to describe a person's reaction to a surprise or shock. The term can also be used to describe a sudden change in direction or speed. In the crossword, the solutions for the term 'Sudden Jump' are 'LEAP' (5 letters) and 'LURCH' (6 letters). Both words refer to a sudden, unexpected movement or change in direction.