sure bet definition, meaning, English dictionary, synonym, see also 'for sure',sure thing',sure enough',be sure', Reverso dictionary, English definition, English. Definition of sure bet in the Idioms Dictionary. sure bet phrase. What does sure bet expression mean? Definitions by the largest Idiom Dictionary. Define sure bet: the one who is certain (to do something) — sure bet in a sentence. Related Words Log in novoline ii tricks sign up to add your own related words. Web News Encyclopedia Images. Or sign up in the traditional way. I before E isn't enough to puzzle out this spelling mystery. Length Length ranks your synonyms based on character count. Wordnik is fiscally sponsored by Planetwork NGO, Inc,a California c 3 non-profit educational organization, EIN Ask the Editors How Often Is 'Biweekly'?