1. (verb)failing, flunk failure to reach a minimum required performance Synonyms: flunk, weakness, failing
2. (verb)fail, flunk, bomb, flush it fail to get a passing grade Synonyms: go, conk out, give way, flunk, bomb, betray, break down, die, neglect, run out, break, flush it, miscarry, give out, fail, go wrong, bombard, go bad