haber gato encerrado

Spanish

Literally, "(for there) to be [an] enclosed cat".

(idiomatic, impersonal) To have something fishy going on
En aquella situación hubo gato encerrado.
There was something fishy going on there.
(idiomatic, impersonal) To have a catch a concealed condition or difficulty
Lo que dice del acuerdo me parece demasiado perfecto. Creo que hay gato encerrado.
What he says does seem too good to be true. I think there's a catch.

Dijo que yo podría tomar todos los libros, pero descubrí que había gato encerrado. Se rompió el brazo y yo necesitaría llevar los todos sin ayuda.
He said I could have all the books, but I discovered that there was a catch. His arm was broken and I had to carry them all myself.