to increase sth in size, number, amount, etc. :
The bad weather only added to our difficulties.
The house has been added to (= new rooms, etc. have been built on to it) from time to time.
to increase sth in size, number, amount, etc. :
The bad weather only added to our difficulties.
The house has been added to (= new rooms, etc. have been built on to it) from time to time.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005