This is the 7964th most frequent Polish word.
mławie
"Mławie" does not have a meaning in Polish as a standard word. It might be a proper noun or a misspelling.
In this sentence, 'Mławie' refers to the proper noun of a town.
Mławie to małe miasto w Polsce.
Mławie is a small town in Poland.
Here, 'mławie' is used to describe an auditory impression related to the town.
Słyszałem w mławie echo głośnych rozmów.
I heard in the echo of loud conversations in the small town.
In this sentence, 'mławie' refers to a specific location within the town.