If you say that someone is ~, you mean that their mouth is hanging open, often because they are surprised.
He just gazed at me ~.
ADJ
If you say that someone is ~, you mean that their mouth is hanging open, often because they are surprised.
He just gazed at me ~.
ADJ
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012