spyon
- Watch, secret agent-style
- Watch without being noticed: 2 wds
- Watch with a webcam, perhaps
- Watch using bugs
- Watch unseen
- Watch in secret
- Watch from the trees, say
- Watch from concealment
- View slyly
- Track, as the feds might do to a suspect
- Tail, perhaps
- Tail, e.g
- Surveil: 2 wds
- Shadow, e.g
- Secretly monitor
- Observe with a nanny cam, say
- Observe from hiding
- Bug, say
- Secretly watch: 2 wds
- Watch secretly: 2 wds
- Watch slyly
- Observe furtively
- Watch through binoculars, say
- Watch furtively
- Observe secretly
- Shadow, e.g.
- Watch covertly
- Watch surreptitiously
- Watch from hiding
- Observe surreptitiously
- Keep under surveillance
- Watch stealthily
- Watch sneakily over
- Tail, maybe
- Observe covertly