to speak or write to sb about sth that they may be able to deal with or help you with :
They decided to take the matter up with their MP.
to speak or write to sb about sth that they may be able to deal with or help you with :
They decided to take the matter up with their MP.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005