Cut up Definition 1 of 3Pro Tip 1/3Physical Action Used when describing a physical action of making something into smaller parts. Please cut up the pizza into eight slices. Pro Tip 2/3Cooking Context Often used in cooking, to refer to preparing ingredients by cutting them. Could you cut up the potatoes before boiling? Pro Tip 3/3Emotionally Charged Sometimes it implies frustration or anger when someone has to cut something up. He was so mad, he cut up all her letters.