noun
the act of secretly obtaining information about another country or organization
verb
to secretly collect information about another country or organization
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The government was accused of spying on its citizens without their consent.
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I heard that Sarah's ex-boyfriend has been spying on her social media accounts.
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I can't believe you're still spying on your crush, that's so creepy!
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The detective felt like he was spying on the suspect's every move, even though he was just observing from a distance.