What is the meaning of Werren?

to tangle, to bring into disarray

to confuse

to destroy

to hinder

to damage, to harm [with dative]

to cause worry or pain

to quarrel, to dispute

To attack, fight or war (against something or someone); to be involved in or engage in armed conflict.

To inflict destruction or devastation by way of conflict or battle; to bring to ruin.

To attack outside armed conflict; to fight one-on-one or in a disorganised manner.

To attack a religion (or its people) or a value; to enter into religious or moral conflict.

To denigrate, show enmity towards, punish, or afflict a religion or its followers.

To have one's knowledge on a topic turn clouded or unclear.

Source: wiktionary.org