I DON'T KNOW HOW, WHY, ETC. ...


Meaning of I DON'T KNOW HOW, WHY, ETC. ... in English

( informal ) used to criticize sb's behaviour :

I don't know how you can say things like that.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.