| ferret out(verb, search) |
| root out(verb, expression, determine, follow, discover) |
| ascertain(study, determine, correct, follow, examine) |
| be on to(verb, determine, follow, discover, pursue) |
| bug(verb, follow, harass, trace, seek) |
| case(verb, study, consider, correct, examine) |
| chase(verb, determine, follow, discover, pursue) |
| chase down(verb, expression, determine, follow, discover) |
| check(verb, examine, try, test, prove) |
| dig out(verb, expression, determine, follow, discover) |
| drive out(verb, expression, determine, follow, discover) |
| follow(verb, determine, discover, pursue, find) |
| get at(verb, expression, determine, follow, discover) |
| go through |
| hunt(verb, determine, follow, discover, pursue) |
| hunt down(expression, determine, follow, discover, harass) |
| penetrate(verb, determine, follow, discover, pursue) |
| pierce(verb, determine, follow, discover, pursue) |
| probe(verb, study, determine, correct, follow) |
| pry(verb, determine, follow, discover, pursue) |