fifth-columnist

listen to the pronunciation of fifth-columnist
English - Turkish
beşinci köşe
English - English
person willing to cooperate with an aggressor against his own country, secret supporter of an enemy that engages in espionage or sabotage against his own country
a member of a clandestine subversive organization who tries to help a potential invader
A fifth columnist is someone who secretly supports and helps the enemies of the country or organization they are in. = traitor