From Longman Dictionary of Contemporary Englishbe an itembe an iteminformalSEX/HAVE SEX WITH if two people are an item, they are having a romantic or sexual relationship → item
Examples from the Corpus
be an item• They're not an item any more.• Assets A financial institution's assets are items it owns and its claims on others.• Here is an item he told me today.• The motivation issue is not an easy one to discuss, since it is an item which is seldom adequately defined.• All of the solos are items from original Sousa programs.• Specials are items that are priced less than their regular price for a period of time, perhaps only one day.• Third, there are items that are not measured because of shortcomings of the data sources.• This is an item which should not be used. 