This is the 12838th most frequent Polish word.
nożna
"Nożna" means "foot-related" or pertains to "soccer/football" in contexts like "piłka nożna" (football/soccer).
The word 'nożna' is used as part of the term 'piłka nożna,' meaning 'football.' It denotes 'leg-related' or 'pertaining to the legs,' as football involves playing primarily with the legs.
Piłka nożna jest najpopularniejszym sportem w Polsce.
Football is the most popular sport in Poland.
Here, 'nożna' is again used in the term 'piłkę nożną,' which is the accusative form of 'piłka nożna' in this context. It retains its meaning related to 'leg' or 'leg-related' aspects.
Grając w piłkę nożną, trzeba uważać na urazy nóg.
While playing football, one needs to watch out for leg injuries.
In this instance, 'nożną' in 'piłką nożną' (instrumental form) maintains its lexical function referring to football in the broader context of sports.