This is the 5927th most frequent Polish word.
znają
"Znają" means "they know."
In this sentence, 'znają' is the third-person plural form of 'znać,' meaning 'to know' in the sense of being familiar with information or a fact.
Oni znają prawdę.
They know the truth.
Here, 'znają' is used to express familiarity or knowledge about a movie.
One znają ten film.
They know this movie.
This question form of using 'znają' demonstrates its use in querying knowledge or awareness of something.