Breadcrumb Home > Thesaurus > O Synonyms of overarch Find synonyms for: Verb1. overarch, predominate, dominate, rule, reign, prevailusage: be central or dominant; "This scene overarches the entire first act"2. overarch, arch overusage: form an arch over; "Big rocks overarch the stream"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of overarch (Dictionary) ✖ Related Content Daily Word Quiz: ultimathule Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language