The phrase "to slice up" means to divide something into smaller pieces or parts. It can also mean to cut something into thin slices, as if with a knife. This term is commonly used in reference to food preparation, where it may refer to cutting fruits and vegetables into small pieces for cooking or serving. Additionally, the phrase "to slice up" can be used figuratively to describe dividing something into smaller portions or segments, such as slicing up a project into manageable tasks or slicing up time in order to accomplish multiple goals.