used to tell sb not to worry about sth they have done :
'Sorry—I've spilt some wine.' 'Never mind. These things happen.'
used to tell sb not to worry about sth they have done :
'Sorry—I've spilt some wine.' 'Never mind. These things happen.'
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005