What is the movement of water up beach called?

The movement of water up beach is called swash. Swash is the term used to describe the uprush of water on a beach, typically after a wave has broken. This motion is caused by the wave's energy being released as it crashes onto the shore. The swash may carry water, sediment, and debris further up the beach. It is an important process in beach erosion and the overall evolution of the coastline.