if you bring a situation to a head or if a situation comes to a head, you are forced to deal with it quickly because it suddenly becomes very bad（使）事情达到紧要关头，需要当机立断
The chairman's resignation finally brought matters to a head.主席的辞职最终使事情到了紧要关头。
The dispute finally came to a head in March that year.这场争论最终在当年三月达到了白热化阶段。
Things came to a head when several of the nurses made a formal complaint.一些护士正式投诉后，事情到了非处理不可的地步了。