| scout(verb, examine, case, discover, watch) |
| scrutinize(verb, examine, discover, watch) |
| secretly follow(verb, expression, examine, case, discover) |
| set eyes on(verb, expression, idiom, phrasal verb, examine) |
| shadow(verb, examine, case, discover, watch) |
| stake out(verb, expression, phrasal verb, examine, case) |
| tail(verb, examine, case, discover, watch) |
| take in(verb, expression, phrasal verb, examine, discover) |
| take note(verb, expression, examine, case, discover) |
| trail(verb, examine, case, discover, watch) |
| view(verb, examine, discover, watch, scrutinize) |
| watch(verb, examine, discover, scrutinize) |
| nose around(verb, expression, discover, snoop) |
| work undercover(verb, expression, discover, snoop) |