/ Dictionary / Index C cossie: Meaning and Definition of Find definitions for: cos•sie Pronunciation: (koz'ē), [key] — n. Australian Informal. a bathing suit; bathers. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cosset cost Related Content Daily Word Quiz: sinister Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language