Fall flat on your face

Literalmente esta frase implica caerse y golpearse la cara, pero en realidad tiene el significado de "fracasar en algo".
Don't blame me if you fall flat on your face!

Cambridge nos dice que además tiene una connotación de "embarrassing way".

The new scheme fell flat on its face in spite of all the financial support that was given.
It's always amusing to see a newscaster fall flat on his face.

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