sleeper agent

Noun

 * 1) A spy who is placed in a target country or organisation, not to undertake an immediate mission, but rather to act as a potential asset if activated.

Translations

 * Chinese:
 * Mandarin: 潛伏特工
 * Finnish: nukkuva agentti
 * French: ,
 * Portuguese: agente adormecido, agente dormente
 * Russian:
 * Spanish: agente durmiente
 * Swedish: