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| English | Russian |
| accident frequency rate | коэффициент промышленного травматизма |
| accident rate | коэффициент промышленного травматизма |
| on accident | случайно ("By design" is the opposite of "by accident", and both use the preposition "by." Prepositional expressions like this are idiomatic, but "on accident" is simply a mistake, however frequent.  vocabulary.com Баян) |
| on accident | нечаянно (Баян) |