| glance(verb, study, consider, see, observe) |
| glare(verb, consider, see, note, regard) |
| grass(noun, sneak, decoy, informer, informant) |
| have in sight(expression, idiom) |
| keep under surveillance(verb, expression, idiom, follow, discover) |
| lay eyes on(verb, expression, idiom, consider, see) |
| lightly |
| look for(verb, expression, phrasal verb, follow, examine) |
| look into(verb, expression, study, consider, sound) |
| look on(verb, expression, mark, consider, see) |
| look upon |
| lookout(noun, person, plant, watch, guard) |
| messenger(information, representative, sneak, envoy, informant) |
| narc(grass, decoy, informer, rat) |
| nose around(verb, expression, phrasal verb, study, consider) |
| patrolman(noun, warning) |
| peep at(verb, expression, phrasal verb, see, spot) |
| pick out(verb, expression, see, catch, observe) |
| pick up on(verb, expression, idiom, mark, see) |
| poke(verb, study, consider, examine, review) |