| beat off(expression, hold, maintain, oppose, secure) |
| bed(noun, supply, deposit, pit, excavation) |
| blight |
| blitz |
| blow up(verb, phrasal verb, destruction) |
| bulwark(verb, hold, maintain, oppose, secure) |
| canal(opening, channel, trench) |
| capital(noun, account, trust, reserve, wealth) |
| channel(noun, verb, turn, produce, clean) |
| chasm(well, hole, hollow) |
| cherish(verb, hold, maintain, oppose, secure) |
| coal mine(expression, idiom) |
| coalfield(noun, pit, seam, excavation, coalmine) |
| confound(verb, destruction) |
| conserve(verb, hold, maintain, oppose, secure) |
| contend(verb, hold, maintain, oppose, secure) |
| corrode(hurt, ruin, challenge, weaken, frustrate) |
| cover(verb, hold, maintain, oppose, secure) |
| deadfall(noun, trap, bomb) |
| deepen(verb, turn, produce, clean, discover) |