/ Thesaurus / M Synonyms of muddy up Find synonyms for: Verb1. muddy, muddy up, dirty, soil, begrime, grime, colly, bemireusage: dirty with mudWordNet 3.0 Copyright 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: dentifrice Analogy of the Day: Today?s Analogy Spelling Bee: Today?s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language