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| an intense, localized downdraft of air that spreads on the ground, causing rapid changes in wind direction and speed; a localized downpour |
| a wind of 25?30 mph (11?13 m/sec) |
| overcast | |
| —adj | |
| 1. | covered over or obscured, esp by clouds |
| 2. | meteorol (of the sky) more than 95 per cent cloud-covered |
| 3. | gloomy or melancholy |
| 4. | sewn over by overcasting |
| —vb | |
| 5. | to make or become overclouded or gloomy |
| 6. | to sew (an edge, as of a hem) with long stitches passing successively over the edge |
| —n | |
| 7. | a covering, as of clouds or mist |
| 8. | meteorol the state of the sky when more than 95 per cent of it is cloud-covered |
| 9. | mining a crossing of two passages without an intersection |