/ Thesaurus / M Synonyms of mat up Find synonyms for: Verb1. felt, felt up, mat up, matt-up, matte up, matte, mat, changeusage: change texture so as to become matted and felt-like; "The fabric felted up after several washes"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: reticent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language