The difference between Cock-and-bull story and Fish story
When used as nouns, cock-and-bull story means a far-fetched and fanciful story or tale of highly dubious validity, whereas fish story means an exaggerated or boastful story.
check bellow for the other definitions of Cock-and-bull story and Fish story
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Cock-and-bull story as a noun (idiomatic):
A far-fetched and fanciful story or tale of highly dubious validity.
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Fish story as a noun:
An exaggerated or boastful story.