This is the 5398th most frequent Polish word.
stawu
"Stawu" is the genitive or locative form of the Polish word "staw," meaning "pond" or "joint" (in anatomy).
Here, 'staw' is a noun used to describe a pond, which is a body of still water.
W okolicy znajduje się piękny staw.
There is a beautiful pond in the area.
Here, 'staw' refers to a joint in the human body, specifically the elbow joint in this context.
Zwichnąłem staw łokciowy podczas upadku.
I dislocated my elbow joint during the fall.
In this sentence, 'stawu' is used in the genitive case, indicating possession or association with the term pond.