This is the 12645th most frequent German word.
werfern
It seems "werfern" is not a standard German word. Could you mean "werfen"? If so, it means "to throw."
In this sentence, 'werfen' is used in its basic meaning to describe the action of throwing something.
Ich werfe den Ball in den Korb.
I throw the ball into the basket.
Here, 'werfen' is used metaphorically to describe directing a glance at someone.
Der Chef warf mir einen kritischen Blick zu.
The boss cast a critical glance at me.
In this sentence, the verb 'werfen' is part of the phrasal verb 'aufwerfen', meaning 'to bring up' or 'to raise' a topic or idea.