1. (noun) spying
keeping a secret or furtive watch
Synonyms: espial, spotting, catching, undercover work, detection
2. (noun) spying, undercover work
the act of keeping a secret watch for intelligence purposes
Synonyms: spying, espial, spotting, catching, undercover work, detection
3. (noun) detection, catching, espial, spying, spotting
the act of detecting something; catching sight of something
Synonyms: detective work, spying, staining, sleuthing, sensing, detecting, detection, signal detection, catching, espial, maculation, undercover work, spotting, contracting
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