This is the 615th most frequent Polish word.
boisku
"Boisku" means "sports field" or "playing field" in English.
Here, 'boisku' denotes the location where the activity of playing soccer occurs.
Dzieci grają w piłkę nożną na boisku.
The children are playing soccer on the field.
'Boisku' is used to specify a meeting location.
Spotkamy się na boisku po zajęciach.
We will meet on the field after classes.
Although 'boisku' is not directly in the sentence, its nominative form, 'boisko,' specifies a particular field in context.