/ Thesaurus / U Synonyms of undertide Find synonyms for: Noun1. undertide, undercurrent, current, streamusage: a current below the surface of a fluidWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language