fox in the henhouse

Meaning: (idiomatic,figurative)Someone untrustworthy placed in apositionoftrustin which they will beharmful,damagingordetrimentalfor their own personal gain.1995October 10, David L. Hill, “The Putsch to Enfeeble the Independent U.S. Inventor”, inImpact on U.S. Exporters of the New GATT Patent Accord: Hearing Before the[…]House of Representatives[…], published1997,pages76–7:While the Commissioner of Patents is normally expected to understand and to promote the patent system as a bulwark for promoting the U.S. economy, the current Commissioner is, in many ways, afox in the henhouse, undertaking to destroy that which he was commissioned to protect and to strengthen.

Examples:

EN: When you find a fox in the henhouse, you kill it with a spade.
ES: Cuando se encuentra al zorro en el gallinero, se le mata a cuchilladas.
EN: He's the fox in the henhouse!
ES: ¡Él es el zorro del gallinero!
EN: I thought you knew me better than this. So you think you're the fox in the henhouse, huh?
ES: Te crees mucho... no, Jonathan piensas que puedes salir con mi chica?
EN: You got a fox in the henhouse, that's what you got yourself.
ES: Has metido un zorro en casa, aquí tienes lo que has metido. Tienes un zorro en casa.
EN: Put the fox in the henhouse.
ES: Puso al zorro en el gallinero.
EN: What, you think maybe we've got another fox in the henhouse, then?
ES: ¿ Crees que tenemos otra brecha en la defensa?
EN: I see you let the fox in the henhouse.
ES: Veo que dejó al zorro entrar al gallinero.
EN: Well, I got a surprise for the next fox in the henhouse, tell you that much.
ES: Pues tengo una sorpresa para el siguiente zorro que se meta en el gallinero, te lo digo en serio.
EN: ! That maybe there's a fox in the henhouse?
ES: ¿Que quizá hay un zorro en el gallinero?
EN: We let a fox in the henhouse.
ES: Hemos dejado entrar al zorro en el gallinero.
EN: When you got a fox in the henhouse... only two things to do:
ES: Cuando tienes a un zorro en el gallinero, sólo hay dos cosas por hacer:
EN: There's a fox in the henhouse.
ES: Hay un zorro en el gallinero.
EN: Archie Andrews is our fox in the henhouse.
ES: Archie Andrews es nuestro zorro en el gallinero.
EN: He's playing both ways. - You've let the fox in the henhouse.
ES: El cabrón juega con dos barajas, has metido al zorro en el gallinero.
EN: Absentee parents, too self-absorbed to notice a fox in the henhouse.
ES: Padres ausentes tan egocéntricos que no vieron al lobo con piel de cordero.

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