Old Wives' Tale Definition

noun
A silly story or superstitious belief.
Webster's New World

A supposed truth that has been passed down by word of mouth.

Wiktionary

A rumour, myth or superstition; something which is almost certainly untrue, despite acceptance by many.

Wiktionary

Other Word Forms of Old Wives' Tale

Noun

Singular:
old wives' tale
Plural:
old-wives-tales

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