| challenge(verb, set, advance, undertake) |
| chip away at(verb, expression, idiom, work, attack) |
| compete(verb, work, attack, struggle) |
| contend(verb, work, attack, struggle) |
| contest(verb, work, attack, struggle) |
| dare say(verb, expression, idiom, advance, challenge) |
| diagnose(examine, test, investigate, analyze) |
| drive for(verb, expression, work, attack, struggle) |
| exert oneself(verb, expression, work, attack, struggle) |
| expose(verb, advance, operate, undertake) |
| fool with(expression, examine, test, investigate) |
| futz around(expression, examine, test, investigate) |
| go after(verb, expression, work, attack, struggle) |
| go all out(verb, expression, idiom, work, attack) |
| go for(verb, expression, work, attack, struggle) |
| have a crack(verb, expression, idiom, work, attack) |
| have a fling at(verb, expression, idiom, advance, challenge) |
| have a go(verb, expression, idiom, work, attack) |
| have a shot(verb, expression, idiom, work, attack) |
| have a stab(verb, expression, idiom, work, attack) |