Definition of CONCUSSION

a forceful coming together of two things <the concussion of the airliner slamming into the skyscraper was felt for several blocks in all directions>
the violent coming together of two bodies into destructive contact <the theory that such a concussion, by a giant asteroid or comet millions of years ago, led to the extinction of the dinosaurs>

April 02, 2015
capricious Hear it
impulsive or unpredictable
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