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spy on

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phrasal verb [transitive]
Word Forms
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present tense
I/you/we/theyspy on
he/she/itspies on
present participlespying on
past tensespied on
past participlespied on
  1. 1
    spy on someone to watch someone secretly so that you know everything that they do

    Managers feel it is their duty to spy on the workforce.

  2. 2
    spy on someone/something to find out secret information about what a country or an organization is doing

    They were accused of spying on Soviet military installations.

See also main entry: spy

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