This is the 12170th most frequent Polish word.
marszach
"Marszach" is the locative plural form of "marsz," which means "marches" (military marches or protest marches) in English.
The word 'marszach' is used here as the locative plural form of 'marsz' (march), referring to participation in events.
Uczestniczę w różnych marszach społecznych.
I participate in various social marches.
Here, 'marszach' is used to describe the time or events during military marches in the locative plural.
Podczas marszach żołnierze pokazali swoją dyscyplinę.
During the marches, the soldiers showed their discipline.
In this sentence, 'marszach' signifies the location or context of the marches, again employing the locative plural form.