The phrase "asset moves" refers to when something valuable (such as money, property, or valuable items) is transferred or relocated from one place to another. Full definition
This is because you can profit when the underlying asset moves in relation to the position taken, without ever having to own the underlying asset. (daytrading.com)
Your profit or loss is defined by the volume of your position and by whether the price of the underlying asset moves in your predicted direction. (global.bdswiss.com)