used to suggest that sb could do sth while they are doing sth else :
'I'm just going to buy some postcards.' 'Can you get me some stamps while you're at it?'
used to suggest that sb could do sth while they are doing sth else :
'I'm just going to buy some postcards.' 'Can you get me some stamps while you're at it?'
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005