дурную траву из поля вон

• ХУДУЮ <ДУРНУЮ, СОРНУЮ> ТРАВУ ИЗ <С> ПОЛЯ ВОН; ХУДАЯ <ДУРНАЯ, СОРНАЯ> ТРАВА ИЗ ПОЛЯ ВОН

[saying]

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⇒ those that are harmful or not needed should be removed (usu. said as an appeal to get rid of a person or people who are considered harmful or useless to society or to some group):

- ≈ get rid of the bad apples <the deadwood>.