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1) A downburst is a strong downdraft which includes an outburst of potentially damaging winds on or near the ground. If the diameter of the downburst is less than 2.5 miles, it is called a microburst.

2) Also used in popular vernacular to refer to brief expressions of fear, anger, sadness, joy, pleasure. . .
We heard there were microbursts in the area, but the soccer game continued. Because we are just that hard core.

He had a microburst when I told him I had shared his secret with the whole department.

When I crossed the finish line (winning my first Olympic Gold) and heard the crowd cheering, I had a microburst to end all microbursts.
by ripcurlgrrl May 25, 2005