to divide sth into two equal parts :
The country was split down the middle over the strike (= half supported it, half did not) .
to divide sth into two equal parts :
The country was split down the middle over the strike (= half supported it, half did not) .
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005