(haber) gato encerrado: un factor o motivo oculto, sospechoso o engañoso.
-Si saben que eso va a devaluar el terreno, no entiendo por qué no hacen nada por evitarlo. Aquí hay gato encerrado, te lo digo yo — If they know that that is going to devalue the land, I don't understand why they don't do something to stop it. Something fishy is going on here / There's more to this than meets the eye / Something is rotten in the state of Denmark
-¿Y por qué iban a hacerlo gratis? -Os digo la verdad, no hay gato encerrado — Why would they do it for free? -I'm telling you the truth. There's no hidden agenda
-Tú sígueme el rollo, pero tienes que hacer como que te sorprende un poco, porque si no van a sospechar que hay gato encerrado — You just play along, but you have to pretend to be a little surprised, because if not they'll smell a rat
-Los padres solicitaron una segunda autopsia porque pensaban que había gato encerrado — The parents requested a second autopsy because they thought something fishy was going on
