fifth columnist

• Persona que trabaja en secreto para socavar o destruir un grupo, organización o nación desde dentro, generalmente en apoyo de un enemigo externo o de una fuerza contraria.

A person who secretly works to undermine a group, organization, or nation from within, typically in support of an external enemy or opposing force.

1. Traitor or saboteurC1formal

   A person who secretly works to undermine a group or nation from within, especially during a conflict.

   Quinta columna

   • During the war, the government was wary of fifth columnists within its borders.
   • He was accused of being a fifth columnist for leaking sensitive information.
   • The organization expelled any suspected fifth columnists.