| droop(drop, decline, fall, plunge, slide) |
| drooping |
| drop-off(noun, drop, decline, fall, plunge) |
| dwindling(adjective, declining, shrinking, lowering, falling) |
| dying down(expression, adjective, declining, shrinking, lowering) |
| ebbing(adjective, declining, shrinking, lowering, falling) |
| fading away(expression, adjective, declining, shrinking, lowering) |
| fallen |
| foundering |
| free fall(noun, descent) |
| go down(verb, phrasal verb) |
| grade(drop, decline, fall, plunge, slide) |
| gradient(drop, decline, fall, plunge, slide) |
| gravitation |
| header(drop, decline, fall, plunge, slide) |
| hill(drop, fall, plunge, slide, dive) |
| incline(drop, fall, plunge, slide, dive) |
| landslide(drop, decline, fall, plunge, slide) |
| lightening(adjective, declining, shrinking, lowering, falling) |
| losing momentum(expression, adjective, declining, shrinking, lowering) |