/ Thesaurus / T Synonyms of toss up Find synonyms for: Noun1. tossup, toss-up, even chance, luck, fortune, chance, hazardusage: an unpredictable phenomenon; "it's a toss-up whether he will win or lose"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: ravenous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language