| channel(noun, line, water, plain, depression) |
| groove(noun, drain, means, channel) |
| cup(noun, depression, channel, bottom) |
| excavation(noun, drain, ditch, bottom) |
| valley(noun, hollow, bottom, gorge) |
| dale(noun, bottom, gorge, valley) |
| dimple(depression, hollow, bottom, scrape) |
| indentation(noun, depression, hollow, bottom) |
| blight(decline, low, collapse, failure, depression) |
| bottom(decline, low, collapse, failure, depression) |
| socket(bottom, cavern) |
| cavern(noun, bottom) |
| depreciation(noun, decline, low, collapse, failure) |
| downslide(noun, decline, low, depression) |
| downswing(decline, low, depression, recession) |
| downtrend(decline, low, collapse, failure, depression) |
| downturn(noun, decline, low, depression) |
| dumps(decline, low, collapse, failure, depression) |
| falling-off(noun, decline, low, collapse, failure) |
| funk(decline, low, collapse, failure, depression) |