noun
the practice of spying or using spies to obtain information about the plans and activities of a foreign government or organization
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The government launched an investigation into allegations of espionage by foreign agents.
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I heard that there was some espionage going on between rival companies.
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Don't mess with him, he's involved in some shady espionage stuff.
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In the world of politics, espionage is like a game of chess, with each move carefully calculated.