1. A grammatical subject that refers to a group of people or things acting as a single unit, often treated as singular in agreement with the verb
The team is playing well; it has won five games in a row.
O time está jogando bem; ele ganhou cinco jogos seguidos.
2. In philosophy and social theory, a group or community considered as an agent capable of collective action and thought
The collective subject of the working class drove social movements throughout history.
O sujeito coletivo da classe trabalhadora impulsionou movimentos sociais ao longo da história.