| put to the test(verb, expression, idiom, study, consider) |
| run down(verb, expression, phrasal verb, study, consider) |
| scrutiny(noun, investigation, monitor, tap) |
| snoop(verb, spy, monitor, poke) |
| stake out(verb, expression, phrasal verb, study, consider) |
| superintendence(noun, scrutiny, investigation, monitor) |
| supervision(noun, scrutiny, investigation, monitor) |
| surveyance(noun, scrutiny, investigation, monitor) |
| tab(noun, scrutiny, investigation, monitor) |
| tail(noun, scrutiny, investigation, monitor) |
| track(noun, scrutiny, investigation, monitor) |
| tune in on(verb, expression, idiom, poke) |
| vigil(noun, scrutiny, investigation, monitor) |
| vigilance(noun, scrutiny, investigation, monitor) |
| watch(noun, scrutiny, investigation, monitor) |
| ears into(verb, expression, spy, snoop) |
| hidden microphone(noun, expression) |
| listen in on(verb, expression, idiom, phrasal verb) |
| overhear(verb, spy, monitor, tap) |
| surveillance device(noun, expression) |