| comprehend(verb, grasp, understand, learn) |
| con(verb, study, get, determine, gain) |
| crash(verb, touch, hit, fight, physical) |
| crump(verb, crunch) |
| cut to pieces(expression, idiom) |
| delve(verb, touch, physical) |
| drive(verb, work, strain, labor, endeavor) |
| effort(noun, business, performance, work, burden) |
| employment(noun, business, work, burden, job) |
| erase(verb, smooth, clean, spread, stroke) |
| exercise(noun, verb, business, work, direct) |
| fragment(verb, beat, crush, smash, shatter) |
| grind down(verb, phrasal verb, contraction) |
| grinding |
| groan(verb, squeal) |
| gum(verb, gnaw, masticate) |
| hammer away(expression, study, give, determine, direct) |
| hammer away at(expression, idiom) |
| harry |
| industry(noun, activity, work, thing, practice) |