The difference between Fish story and Traveller's tale
When used as nouns, fish story means an exaggerated or boastful story, whereas traveller's tale means an account that cannot be believed.
check bellow for the other definitions of Fish story and Traveller's tale
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Fish story as a noun:
An exaggerated or boastful story.
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Traveller's tale as a noun:
An account that cannot be believed; a tall story; a whopper.