used to say that sb's explanation, excuse, etc. is not valid or that you/sb else will not accept it :
That excuse simply won't wash with me.
used to say that sb's explanation, excuse, etc. is not valid or that you/sb else will not accept it :
That excuse simply won't wash with me.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005