Quote:
Originally Posted by AngelicaDeAlquezar
Yes, it is always negative.
It is used to say that someone pretended to be something they are not. Their true intentions or defects are shown by some act they committed. I think it comes from old falsified currency that were pieces of copper covered in a thin golden layer and they paid with them as if they were gold. A little scratch, and the copper core showed up.  |
Según ===>
se trata de una locución Mexicana. Nunca la había escuchado ni leído
Conosco bien "mostrar la hilacha" que es muy parecido y tiene origen judío, según ===>