Definition of spy verb from the Oxford Advanced American Dictionary

     

    spy

     verb
    verb
    NAmE//spaɪ//
     
    Verb Forms present simple I / you / we / they spy
     
    he / she / it spies
     
    past simple spied
     
    -ing form spying
     
     
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  1. 1[intransitive] to collect secret information about another country, organization, or person He spied for his government for more than ten years.
  2. 2 [transitive] spy somebody/something (literary or formal) to suddenly see or notice someone or something In the distance we spied the Pacific for the first time.
  3. Phrasal Verbsspy on somebody/somethingspy somethingout
See the Oxford Advanced Learner's Dictionary entry: spy