This is the 2493rd most frequent Portuguese word.
contra
"Contra" in English means "against."
In this sentence, 'contra' is used to indicate opposition or disagreement to a set of rules.
Ele agiu contra as regras estabelecidas.
He acted against the established rules.
Here, 'contra' is used to describe physical contact or pressing one object against another.
Empurrei a porta contra a parede para mantê-la aberta.
I pushed the door against the wall to keep it open.
In this usage, 'contra' is employed to describe resistance or efforts directed to counteract or prevent an issue, like pollution.