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ground zero: Word of the day for September 11, 2021

ground zero , n :
Originally, the point on the land or water surface below which a nuclear bomb detonates in the air; now also the point on such a surface at or above the detonation. (by extension) The location of any disaster or violent assault. (figuratively) The point at which something begins. The September 11 attacks took place in the United States on this day 20 years ago in 2001.
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