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spy noun | verb
 1 
spy / spaI ; spaI /noun (plural spies) C
1. someone whose job is to find out secret information about another country, organization, or group间谍;SYNsecret agent
British / Russian / foreign etc
spy a Soviet spy苏联间谍
spy ring / network ( = an organized group of spies )间谍网
spy plane / satellite间谍飞机/卫星
 2 
spyverb
spied, spying, spies
1. Ito secretly collect information about an enemy country or an organization you are competing against从事间谍活动; 秘密收集情报:
[+ on ]
He was charged with spying on British military bases.他被指控刺探英国军事基地情报。
[+ for ]
He confessed to spying for North Korea.他招供了为北韩从事间谍活动。
2. Tliteraryto suddenly see someone or something, especially after searching for them〔尤指通过搜索后〕突然看见,突然发现;SYNspot
Ellen suddenly spied her friend in the crowd.埃伦突然在人群中看到了她的朋友。

 PHRASAL VERBS 
spy on sb
to watch someone secretly in order to find out what they are doing
监视,窥探:
She sent you to spy on me, didn't she?她派你来监视我,对不对?

spy sth ↔ out
1. to secretly find out information about something暗中查明
2. spy out the land BrEto secretly find out more information about a situation before deciding what to do〔作决定前〕暗中摸清情况

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