This is the 7825th most frequent Portuguese word.
quiksilver
The word "quiksilver" is not Portuguese; it refers to a surfwear brand. In Portuguese, "quicksilver" (spelled "quicksilver" or "quiksilver") could colloquially reference the brand but has no specific definition in the language.
Here, 'Quiksilver' refers to the brand of the t-shirt.
Eu comprei uma camiseta da Quiksilver na loja.
I bought a Quiksilver t-shirt at the store.
In this instance, 'Quiksilver' is used to refer to the brand in a general context.
A Quiksilver é conhecida por seu estilo de roupas esportivas.
Quiksilver is known for its style in sportswear clothing.
Here, 'Quiksilver' is mentioned as the sponsor of the event, linking the brand to its promotional activities.