Collins COBUILD Advanced Learner's English Dictionary - fill up

1. If you fill up or fill yourself up with food, you eat so much that you do not feel hungry. Fill up on potatoes, bread and pasta, which are high in carbohydrate and low in fat... When you are happy about yourself you won’t need to fill yourself up with food. PHRASAL VERB: V P on/with n, V pron-refl P with n 2. A type of food that fills you up makes you feel that you have eaten a lot, even though you have only eaten a small amount. Potatoes fill us up without overloading us with calories. PHRASAL VERB: V n P 3. see also fill 1, 2, 6