| tap(noun, verb, study, consider, examine) |
| eavesdrop(verb, spy, listen, monitor) |
| listen in(verb, expression, phrasal verb, study, consider) |
| listening device(noun, expression, hidden microphone) |
| be all ears(verb, expression, idiom, study, consider) |
| following(noun, adjective, scrutiny, investigation) |
| pry(verb, study, consider, examine, review) |
| stakeout(noun, scrutiny, investigation, monitor) |
| bend an ear(verb, expression, idiom, snoop) |
| bugging(noun, scrutiny, investigation, monitor) |
| inquire(verb, study, consider, examine, review) |
| poke(verb, study, consider, examine, review) |
| reconnoiter(verb, study, consider, examine, review) |
| spy(verb, study, consider, examine, review) |
| spying(noun, scrutiny, investigation, monitor) |
| body mike(noun, expression, investigation, monitor) |
| care(noun, scrutiny, investigation, monitor) |
| check over(verb, expression, phrasal verb, study, consider) |
| check up(verb, expression, phrasal verb, study, consider) |
| close observation(noun, expression, investigation, monitor) |