The difference between Fish story and Tall tale
When used as nouns, fish story means an exaggerated or boastful story, whereas tall tale means a greatly exaggerated, fantastic story.
check bellow for the other definitions of Fish story and Tall tale
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Fish story as a noun:
An exaggerated or boastful story.
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Tall tale as a noun (idiomatic):
A greatly exaggerated, fantastic story.
Examples:
"He returned on Monday with a tall tale about a 100-pound fish he had caught."