be an item
To be a romantic couple. I thought Luke and Andrea broke up—is it true that they're an item again?
be an item
INFORMALIf two people are an item, they are having a romantic or sexual relationship. She and Gino were an item.
be an item
(of a couple) be involved in an established romantic or sexual relationship. informal 1997 Independent ‘It is fair to say they are an item but they are not engaged,’ said one of Mr Brown's closest confidantes.
be an ˈitem
(informal) be involved in a romantic or sexual relationship: Are they an item?