( informal ) used to say politely that you would like sth you have been offered :
'Cup of tea, Brian?' 'I don't mind if I do.'
( informal ) used to say politely that you would like sth you have been offered :
'Cup of tea, Brian?' 'I don't mind if I do.'
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005