This is the 9264th most frequent Portuguese word.
cascudo
"Cascudo" refers to something tough or resistant, or it can mean a light punch or tap, often on the head.
Here, 'cascudo' describes a type of fish, specifically the armored catfish known for its tough skin.
O peixe cascudo fica no fundo do aquário.
The pleco fish stays at the bottom of the aquarium.
In this context, 'cascudo' is used metaphorically to describe something with a hard or sturdy outer layer.
O livro antigo tinha uma capa cascuda.
The old book had a tough cover.
In this sentence, 'cascudo' refers to a playful or light punch on someone's head.