spy on

Definition of spy on

  1. :  to watch (someone) secretly He spies on his neighbors. Have you been spying on me?

Word by Word Definitions

  1. :  to watch secretly usually for hostile purposes

    :  to catch sight of :  see

    :  to observe or search for something :  look

  1. :  one that spies:

    :  one who keeps secret watch on a person or thing to obtain information

    :  a person employed by one nation to secretly convey classified information of strategic importance to another nation


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