| capsize(verb, drop, set, decline, drive) |
| cascade(verb, drop, decline, settle, ease) |
| cast down(verb, expression, drop, decline, drive) |
| cataract(noun, settle, slip, dip) |
| cave-in(noun, drop, fall, collapse, plunge) |
| chimb hoop(expression, idiom) |
| chute |
| class |
| cliff(noun, mount, peak, fell, mound) |
| coast(drop, settle, fall, slip, dip) |
| cock(verb, twist, bend, bow, tip) |
| collapse(noun, verb, drop, decline, settle) |
| color |
| coming down(verb, expression, phrasal verb, drop, fall) |
| couch(verb, drop, set, decline, drive) |
| crouch(settle, slip, dip) |
| curve(verb, twist, bend, bow, tip) |
| cut(noun, drop, decline, decrease, slip) |
| decay(noun, drop, fall, deterioration, falloff) |
| declivity of hill(expression, idiom) |