counterespionage
noun
coun·ter·es·pi·o·nage
ˌkau̇n-tər-ˈe-spē-ə-ˌnäzh
-ˌnäj,
-nij,
Canadian also -ˌnazh;
-ˌe-spē-ə-ˈnäzh;
-ə-ˈspē-ə-nij
: the activity concerned with detecting and thwarting enemy espionage
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Merriam-Webster unabridged
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