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spy

  

      n  
1    double agent, fifth columnist, foreign agent, mole, nark     (Brit., Austral., & N.Z. slang)   secret agent, secret service agent, undercover agent  
      vb  
2      (usually with)       on   follow, keep under surveillance, keep watch on, shadow, tail     (informal)   trail, watch  
3    behold     (archaic or literary)   catch sight of, descry, espy, glimpse, notice, observe, set eyes on, spot  
English Collins Dictionary - English synonyms & Thesaurus  
Collins

spy

  
  ( spies    plural & 3rd person present)   ( spying    present participle)   ( spied    past tense & past participle  )
1       n-count   A spy is a person whose job is to find out secret information about another country or organization.  
He was jailed for five years as an alleged British spy...     
2       adj   A spy satellite or spy plane obtains secret information about another country by taking photographs from the sky.  
ADJ n  
3       verb   Someone who spiesfor a country or organization tries to find out secret information about another country or organization.  
The agent spied for East Germany for more than twenty years...      V for n  
East and West are still spying on one another...      V on n  
I never agreed to spy against the United States.      V against n  
  spying      n-uncount  
...a ten-year sentence for spying.     
4       verb   If you spy on someone, you watch them secretly.  
That day he spied on her while pretending to work on the shrubs...      V on n  
5       verb   If you spy someone or something, you notice them.  
LITERARY  
(=spot)  

He was walking down the street when he spied an old friend.      V n  

Translation English Cobuild Collins Dictionary  

See also:

spry, spying, sap, say

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