a fish story

a fish story

A big lie. The phrase alludes to the tendency of fishermen to exaggerate the size of the fish they've caught or lost out on. I'm sure Grandpa is just telling you a fish story—there's no way all of that's true!
See also: fish, story

fish story

 and fish tale
Fig. a great big lie. (Like a fisherman who exaggerates the size of the fish that got away.) That's just a fish story. Don't try to fool me. He's a master at the fish tale. Maybe he should be a politician.
See also: fish, story

fish story

An improbable, boastful tale, as in He came up with some fish story about his winnings at the track. This expression alludes to the tendency of fishermen to exaggerate the size of their catch. [Early 1800s]
See also: fish, story

fish story

and fish tale
n. a great big lie. (Like the fisherman who exaggerates the size of the fish that got away.) All we got was a fish story about his luck with the girls. What a liar! He’s a master at the fish tale. Maybe he should be a politician.
See also: fish, story