counter-espionage

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++ˌcounter-ˈespionage noun [uncountable]  the process of trying to stop someone spying on your country 反间谍活动

Examples from the Corpus

counter-espionage• Without ciphers and diplomatic bags, espionage and counter-espionage actions were likely to be circumscribed.• But the republican counter-espionage was highly organized, and early in 1814 he was arrested, tried and condemned to death.• They're political - a small counter-espionage unit.

ˌcounter-ˈespionage nounChineseSyllable  

Corpus stop to country on someone spying process trying the of your

counter-espionage
ˌcounter-ˈespionage noun [uncountable]
the process of trying to stop someone spying on your country

counter-espionageBrE /ˌkaʊntər ˈespiənɑːʒ/ 🔊NAmE /ˌkaʊntər ˈespiənɑːʒ/ 🔊 noun [uncountable] secret action taken by a country to prevent an enemy country from finding out its secrets 反间谍活动