Designed to withstand or protect against crashes or collisions without damage.
From crash (collision) plus proof (resistant to), following the pattern of compound adjectives like 'waterproof' and 'fireproof.' This is a modern coinage reflecting 20th-century safety concerns about vehicles and aviation.
The word 'crashproof' exploded in the 1950s-60s when automotive engineers started designing cars to survive collisions. Before that, crashes were considered inevitable catastrophes; 'crashproof' represents the moment engineers decided to fight physics.
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