covert mission
definitions
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A secret operation or task carried out without public knowledge, often involving espionage, military infiltration, or undercover work intended to remain undetected.en: A secret operation or task carried out without public knowledge, often involving espionage, military infiltration, or undercover work intended to remain undetected.
examples
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A special team of Zhou warriors was assembled for a covert mission.
A special team of Zhou warriors was assembled for a covert mission.