spy [ˈspaɪ]

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¹ spy noun

• a person who tries secretly to get information about a country or organization for another country or organization —often used before another noun
• someone who secretly watches the movement or actions of other people

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² spy verb

• to try secretly to get information about a country, organization, etc. : to act as a spy —often + on
• to see or notice (someone or something)