polarise

Economic crises usually polarise the political debate.

经济危机通常会使政辩论两极化。

In any relationship, people polarise into two positions;

在任何的关系，们会偏向两个极端。

Public opinion polarised into completely opposite opinions on the issue of mercy killing.

公众舆论在安乐死这一问题上分化成了完全不同的对立观点。