To crash into something with force, or when two things hit each other; also when ideas or interests clash.
From Latin 'collidere,' combining 'col-' (together) and 'laedere' (to strike or hurt). The word has meant 'to strike together' since the 17th century.
When asteroids collide in space, physics produces something called 'impact cratering,' and the deeper impact structures reveal the asteroid's interior composition—crashing things together is actually how scientists learn what's inside things that are too far away or too small to examine directly.
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