This is the 8558th most frequent German word.
knast
Prison.
In this context, 'Knast' is used as a colloquial term for 'jail' or 'prison'.
Er landete wegen Diebstahls im Knast.
He ended up in jail because of theft.
Here, 'Knast' conveys the idea of a place of imprisonment, emphasizing its challenges and conditions.
Sie erzählte ihm, wie schwer das Leben im Knast war.
She told him how harsh life in prison was.
'Knast' in this sentence is used to denote the central location of the movie's subject: the jail or prison.