Etiquette is a set of customs and rules for polite behaviour, especially among a particular class of people or in a particular profession.
This was such a great breach of ~, he hardly knew what to do.
= protocol
N-UNCOUNT
Etiquette is a set of customs and rules for polite behaviour, especially among a particular class of people or in a particular profession.
This was such a great breach of ~, he hardly knew what to do.
= protocol
N-UNCOUNT
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012