| pierce(investigate, penetrate, explore, research) |
| prod(investigate, penetrate, explore, research) |
| put out a feeler(expression, idiom, investigate, penetrate) |
| query(demand, search, investigate, ask) |
| quiz(verb, check, examine, try, confirm) |
| ransack(verb, action, turn, investigate) |
| read(verb, study, consider, view, examine) |
| really get into(expression, idiom, action, burrow) |
| rummage(action, investigate, probe, rob) |
| scoop out(expression, action, probe, burrow) |
| shovel(action, investigate, research, probe) |
| sound out(expression, investigate, ask, penetrate) |
| spade(action, investigate, research, probe) |
| tap(verb, study, consider, examine, review) |
| test(verb, check, examine, try, discover) |
| test the waters(expression, idiom, investigate, penetrate) |
| trowel(action, investigate, research, probe) |
| turn inside out(verb, expression, idiom, action, examine) |
| unearth(action, find, uncover, retrieve) |
| wiretap(verb, study, consider, examine, review) |