(~s)
An ~ is someone who is involved in a situation and who knows more about it than other people.
An ~ said, ‘Katharine has told friends it is time to end her career.’
N-COUNT
(~s)
An ~ is someone who is involved in a situation and who knows more about it than other people.
An ~ said, ‘Katharine has told friends it is time to end her career.’
N-COUNT
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012