old wives' tale

a false idea or belief the belief that going outside with wet hair will cause you to catch cold is just an old wives' tale Synonyms delusion, error, falsehood, falsity, hallucination, illusion, misbelief, misconception, myth, fallacy, untruthRelated Words factoid; superstition; fiction, pretense (or pretence); distortion, inaccuracy, misapprehension, miscomprehension, misinterpretation, misjudgment, misperception, misunderstanding; misinformation, misknowledge, misreport, misrepresentation, misstatement; sophism, sophistry; fib, half-truth, lie, story, taleAntonyms truth, verity