This is the 5th most frequent Danish word.
af
"Af" in Danish means "of," "by," or "from," depending on the context.
In this sentence, 'af' is a preposition marking the relational concept of 'off' in English, indicating the action of leaving the bus.
Jeg er bange for at gå af bussen.
I am afraid to get off the bus.
Here, 'af' represents the English equivalent of 'by,' denoting agency, specifically identifying who wrote the book.
Bogen er skrevet af en kendt forfatter.
The book was written by a famous author.
In this case, 'af' translates to 'from,' showing the origin or point of transaction regarding the car.