Quando a gente fica em frente ao mar, a gente se sente melhor....

*knock up* (This phrasal verb has more than one meaning)

Definition: to make something very quickly, using whatever is available [British informal]

E.g.1. There wasn't much food in the cupboard, but I managed to knock up a meal for myself.

E.g.2. They knocked up a shelter out of the driftwood they found on the beach.

This phrasal verb can be separated.