Phrasal verb spy on someone/something (definition of spying from the cambridge advanced learner's dictionary & thesaurus © cambridge university press) The meaning of spy is to watch secretly usually for hostile purposes How to use spy in a sentence. Espionage is defined as the act of spying or using spies, agents, assets, and intelligence officers, as well as technology, to collect secret information, usually through illegal means. To investigate or observe something, especially in secret Spying into the neighbor's activities.
In 1962 the soviet union began to secretly install missiles in cuba to launch attacks on u.s The confrontation that followed, known as the cuban missile crisis, brought the two superpowers to the brink of war before an agreement was reached to withdraw the missiles. The days of cloak and dagger spying look a bit different in the digital age But the spy business itself is busy — and getting busier.
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