| be careful(verb, trouble, see, mind, notice) |
| watch out(verb, expression, phrasal verb, trouble, see) |
| be alert(verb, see, mind, notice, spot) |
| be on guard(verb, trouble, see, mind, notice) |
| be wary(verb, trouble, mind, notice, spot) |
| beware(verb, mind, notice, spot, avoid) |
| check out(verb, expression, phrasal verb, mind, notice) |
| heads up(verb, expression, phrasal verb, see, mind) |
| hearken(verb, mind, notice, spot, avoid) |
| keep an eye out(verb, expression, idiom, phrasal verb, see) |
| keep tabs(verb, expression, see, mind, notice) |
| listen(verb, mind, notice, spot, avoid) |
| notice(verb, mind, spot, avoid, attend) |
| pay attention(verb, expression, see, mind, notice) |
| pick up on(verb, expression, idiom, phrasal verb, see) |
| scope(verb, see, mind, notice, spot) |
| shotgun(verb, see, mind, notice, spot) |
| size up(verb, expression, phrasal verb, see, mind) |
| spot(verb, mind, notice, avoid, attend) |
| spy(verb, mind, notice, spot, avoid) |