The ~s in a particular organization, event, or situation are the most important people or things involved in it.
The former chairman was a ~ in the deals that pushed the bank to the top.
N-COUNT
The ~s in a particular organization, event, or situation are the most important people or things involved in it.
The former chairman was a ~ in the deals that pushed the bank to the top.
N-COUNT
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012