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случайно ("On accident" – это не ошибка, можно использовать "on accident" и "by accident".: This mystery began on accident. I met him on accident.  youtube.com Yura_N) | |||
| нечаянно (Баян); 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: 75 phrases in 26 subjects |