/ Thesaurus / F Synonyms of fill up Find synonyms for: Verb1. fill, fill up, make full, change, alter, modifyusage: make full, also in a metaphorical sense; "fill a container"; "fill the child with pride"2. fill, fill up, change state, turnusage: become full; "The pool slowly filled with water"; "The theater filled up slowly"3. close, fill up, fillusage: fill or stop up; "Can you close the cracks with caulking?"4. fill up, fill, eatusage: eat until one is sated; "He filled up on turkey"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language