The French phrase 'AVEC' and 'chez' are both prepositions that can be translated to English as 'WITH' and 'to Pierre, ' respectively. The phrase 'AVEC, chez Pierre' is a common expression in French that means 'WITH, to Pierre.' It is often used to indicate that someone is accompanying another person, usually a family member or close friend, to a particular place. In this context, it could be used to indicate that someone is going WITH another person to visit Pierre at his home.