An exaggerated, unreliable story: “My uncle claims that he was raised in a drainage ditch, but it's just another of his tall tales.”
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Words nearby tall tale
Idioms and Phrases with tall tale
A fanciful or greatly exaggerated story, as in Some youngsters love tall tales about creatures from outer space coming to earth. This idiom uses tall in the sense of “exaggerated.” [Mid-1800s]